Compositions and methods for decreasing dysbiosis and / or preventing inflammatory bowel disease

Abstract

Provided herein are compositions comprising bacterial mixtures of strains from genera including Roseburia, Dorea, Bacteroides, Coprobacter, Agathobaculum, Lawsonibacter, Tyzzerella, Phascolarctobacterium, Enorma, Faecalimonas, lllomasclavelia, Clostridium, Fournierella, and / or Massilimicrobiota. Also provided are methods of using compositions comprising such bacterial mixtures. In some embodiments, it includes compositions, kits, and methods that are useful, e.g., for treatment and / or prevention of inflammatory bowel disease (IBD), such as ulcerative colitis (UC).

Description

[0001]COMPOSITIONS AND METHODS FOR DECREASING DYSBIOSIS AND / OR PREVENTING INFLAMMATORY BOWEL DISEASE RELATED APPLICATION This application claims the benefit under 35 U.S.C. § 119(e) of the earlier filing date of U.S. Provisional Application No.63 / 548,795, filed February 1, 2024, the contents of which are incorporated by reference herein in their entirety. REFERENCE TO AN ELECTRONIC SEQUENCE LISTING The contents of the electronic sequence listing (P074570032WO00-SEQ-NTJ.xml; Size: 1,458,907 bytes; and Date of Creation: January 30, 2025) are herein incorporated by reference in their entirety. FIELD The disclosure relates to compositions including two or more bacterial strains, and methods for decreasing dysbiosis, and / or preventing inflammatory bowel disease (IBD), using such compositions. BACKGROUND The inflammatory bowel disease (IBD) ulcerative colitis (UC) is a chronic inflammatory disorder of the colon. The exaggerated immune response appears mediated by an interaction between genetic and environmental factors and the gut microbiota. Molodecky & Kaplan, Gastroenterol Hepatol (N Y).2010.6(5):339-346; Khor et al., Nature.2011. 474(7351):307-317. Current treatment modalities are based on local immune suppression with 5-aminosalicylates (5-ASA), temporary prednisolone, thiopurines, or targeted therapy with small molecules and / or biologics. Harbord et al., J Crohns Colitis.2017.11(7):769-784; Talley et al., Am J Gastroenterol.2011.106(Suppl 1):S2-S5. Despite maintenance medication, most patients suffer from periods of flares and ongoing inflammation with a significant impact on quality of life, and the 20-year cumulative colectomy rates after UC diagnosis is 14%. Parragi et al., J Crohns Colitis.2018.12(7):811-818. Also, a subset of patients experiences significant side effects from currently available medication. SUMMARY Provided herein are compositions, kits, and methods that are useful, e.g., for treatment and / or prevention of inflammatory bowel disease (IBD), such as ulcerative colitis (UC). Ulcerative colitis is a chronic inflammatory disorder of the colon characterized by a proinflammatory cytokine microenvironment with a reduced ratio of regulatory T cells (Tregs) to proinflammatory T helper 17 cells (Th17) (Treg:Th17 ratio) and reduced levels of short-chain fatty acids (SCFAs). The exaggerated immune response appears mediated by an interaction between genetic and environmental factors and the gut microbiota. Despite currently available medications, most UC patients suffer from periods of flares and ongoing inflammation and some experience significant side effects. Following fecal microbiome transplantation in subjects with inflammatory bowel disease, it was observed that donor stool fractions associated with alleviated IBD symptoms in recipients were enriched in certain bacterial strains. Donor stool fractions that alleviated IBD symptoms had microbial community compositions that induced T regulatory cells (Tregs) and produced short-chain fatty acids (SCFAs) (e.g., acetate, propionate, and butyrate) in vivo. A defined microbial consortium including 36 bacterial strains, which were isolated from the same donor whose stool fraction yielded the greatest improvement in IBD symptoms, highest Treg induction, and highest SCFA production in human subjects, similarly alleviated IBD symptoms, induced Treg proliferation and accumulation, and yielded SCFA production in an in vivo colitis model. These findings demonstrate the capacity of bacterial genera and species of these donor samples and / or microbial consortia for treating inflammatory bowel disease. Bacterial genera that were predictive of alleviated IBD symptoms included Coprobacter, Phascolarctobacterium, Roseburia. Additional predictors of positive response included the genera Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, and Enorma. Additionally, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota were abundant in the stool fraction that yielded the greatest improvement in IBD symptoms. Moreover, some genera were associated with a lack of alleviated IBD symptoms (non-response), including Dialister, Prevotella, Slackia, Paraprevotella, Asaccharobacteria and Desulfovibrio. Accordingly, some aspects relate to a method of treating an inflammatory bowel disease (IBD) in a subject in need thereof by administering to the subject a combination comprising two or more of: (1) an isolated bacterial strain belonging to the species Bacteroides caccae; (2) an isolated bacterial strain belonging to the species Bacteroides intestinalis; (3) an isolated bacterial strain belonging to the species Bacteroides faecis; (4) an isolated bacterial strain belonging to the species Bacteroides ovatus; (5) an isolated bacterial strain belonging to the species Bacteroides thetaiotaomicron; (6) an isolated bacterial strain belonging to the species Bacteroides uniformis; (7) an isolated bacterial strain belonging to the species Bacteroides vulgatus; (8) an isolated bacterial strain belonging to the species Bifidobacterium adolescentis; (9) an isolated bacterial strain belonging to the species Bifidobacterium longum; (10) an isolated bacterial strain belonging to the species Bifidobacterium pseudocatenulatum; (11) an isolated bacterial strain belonging to the species Blautia producta; (12) an isolated bacterial strain belonging to the species Clostridium citroniae; (13) an isolated bacterial strain belonging to the species Clostridium clostridioforme; (14) a first isolated bacterial strain belonging to the species Clostridium innocuum; (15) a second isolated bacterial strain belonging to the species Clostridium innocuum; (16) an isolated bacterial strain belonging to the species Paeniclostridium sordellii; (17) an isolated bacterial strain belonging to the species Coprococcus comes; (18) an isolated bacterial strain belonging to the species Dorea longicatena; (19) an isolated bacterial strain belonging to the species Erysipelatoclostridium ramosum; (20) an isolated bacterial strain belonging to the species Eubacterium rectale; (21) an isolated bacterial strain belonging to the species Odoribacter sp.; (22) an isolated bacterial strain belonging to the species Parabacteroides distasonis; (23) an isolated bacterial strain belonging to the species Parabacteroides merdae; (24) an isolated bacterial strain belonging to the species Bacteroides xylanisolvens; (25) an isolated bacterial strain belonging to the species Blautia obeum; (26) an isolated bacterial strain belonging to the species Alistipes putredinis; (27) an isolated bacterial strain belonging to the species Collinsella aerofaciens; (28) an isolated bacterial strain belonging to the species Eubacterium hallii; (29) an isolated bacterial strain belonging to the species Alistipes shahii; (30) an isolated bacterial strain belonging to the species Anaerostipes caccae; (31) an isolated bacterial strain belonging to the species Phascolarctobacterium faecium; (32) an isolated bacterial strain belonging to the species Agathobaculum butyriciproducens; (33) an isolated bacterial strain belonging to the species Bacteroides fragilis; (34) an isolated bacterial strain belonging to the species Fusobacterium mortiferum; (35) an isolated bacterial strain belonging to the species Paraclostridium bifermentans; and (36) an isolated bacterial strain belonging to the species Escherichia coli, in a therapeutically effective amount to induce proliferation and / or accumulation of regulatory T cells in an intestine of the subject. Some aspects relate to a method of treating an inflammatory bowel disease (IBD) in a subject in need thereof by administering to the subject a combination comprising two or more of: (1) an isolated bacterial strain belonging to the species cluster Agathobaculum hominis; (2) an isolated bacterial strain belonging to the species cluster Alistipes putredinis; (3) an isolated bacterial strain belonging to the species cluster Alistipes shahii; (4) an isolated bacterial strain belonging to the species cluster Anaerostipes caccae; (5) an isolated bacterial strain belonging to the species cluster Bacteroides caccae; (6) an isolated bacterial strain belonging to the species cluster Bacteroides cellulosilyticus; (7) an isolated bacterial strain belonging to the species cluster Bacteroides fragilis; (8) an isolated bacterial strain belonging to the species cluster Bacteroides ovatus; (9) a first isolated bacterial strain belonging to the species cluster Bacteroides thetaiotaomicron; (10) a second isolated bacterial strain belonging to the species cluster Bacteroides thetaiotaomicron; (11) an isolated bacterial strain belonging to the species cluster Bacteroides uniformis; (12) an isolated bacterial strain belonging to the species cluster Bacteroides xylanisolvens; (13) an isolated bacterial strain belonging to the species cluster Bacillus paralicheniformis; (14) an isolated bacterial strain belonging to the species cluster Bifidobacterium longum; (15) an isolated bacterial strain belonging to the species cluster Bifidobacterium pseudocatenulatum; (16) an isolated bacterial strain belonging to the species cluster Blautia coccoides; (17) an isolated bacterial strain belonging to the species cluster Blautia_A obeum; (18) an isolated bacterial strain belonging to the species cluster Enterocloster citroniae; (19) an isolated bacterial strain belonging to the species cluster Enterocloster clostridioformis; (20) a first isolated bacterial strain belonging to the species cluster Clostridium_AQ innocuum; (21) a second isolated bacterial strain belonging to the species cluster Clostridium_AQ innocuum; (22) an isolated bacterial strain belonging to the species cluster Collinsella sp019041915; (23) an isolated bacterial strain belonging to the species cluster Bariatricus comes; (24) an isolated bacterial strain belonging to the species cluster Dorea_A amylophila; (25) an isolated bacterial strain belonging to the species cluster Thomasclavelia ramosa; (26) an isolated bacterial strain belonging to the species cluster Escherichia coli; (27) an isolated bacterial strain belonging to the species cluster Anaerobutyricum hallii; (28) an isolated bacterial strain belonging to the species cluster Agathobacter rectalis; (29) an isolated bacterial strain belonging to the species cluster Fusobacterium_A sp900555485; (30) an isolated bacterial strain belonging to the species cluster Odoribacter splanchnicus; (31) an isolated bacterial strain belonging to the species cluster Paraclostridium sordellii; (32) an isolated bacterial strain belonging to the species cluster Parabacteroides distasonis; (33) an isolated bacterial strain belonging to the species cluster Parabacteroides merdae; (34) an isolated bacterial strain belonging to the species cluster Paraclostridium dentum; (35) an isolated bacterial strain belonging to the species cluster Phascolarctobacterium faecium; and (36) an isolated bacterial strain belonging to the species cluster Phocaeicola vulgatus, in a therapeutically effective amount to induce proliferation and / or accumulation of regulatory T cells in an intestine of the subject. Some aspects relate to a method of treating an inflammatory bowel disease (IBD) in a subject in need thereof by administering to the subject a combination comprising two or more of: (1) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 1; (2) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 2; (3) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 3; (4) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 4; (5) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 5; (6) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 6; (7) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 7; (8) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 8; (9) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 9; (10) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 10; (11) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 11; (12) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 12; (13) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 13; (14) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 14; (15) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 15; (16) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 16; (17) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 17; (18) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 18; (19) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 19; (20) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 20; (21) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 21; (22) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 22; (23) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 23; (24) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 24; (25) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 25; (26) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 26; (27) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 27; (28) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 28; (29) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 29; (30) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 30; (31) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 31; (32) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 32; (33) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 33; (34) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 34; (35) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 35; and (36) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 36, in a therapeutically effective amount to induce proliferation and / or accumulation of regulatory T cells in an intestine of the subject. In some embodiments: the isolated bacterial strain of (1) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 1; the isolated bacterial strain of (2) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 2; the isolated bacterial strain of (3) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 3; the isolated bacterial strain of (4) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 4; the isolated bacterial strain of (5) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 5; the isolated bacterial strain of (6) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 6; the isolated bacterial strain of (7) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 7; the isolated bacterial strain of (8) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 8; the isolated bacterial strain of (9) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 9; the isolated bacterial strain of (10) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 10; the isolated bacterial strain of (11) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 11; the isolated bacterial strain of (12) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 12; the isolated bacterial strain of (13) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 13; the isolated bacterial strain of (14) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 14; the isolated bacterial strain of (15) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 15; the isolated bacterial strain of (16) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 16; the isolated bacterial strain of (17) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 17; the isolated bacterial strain of (18) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 18; the isolated bacterial strain of (19) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 19; the isolated bacterial strain of (20) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 20; the isolated bacterial strain of (21) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 21; the isolated bacterial strain of (22) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 22; the isolated bacterial strain of (23) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 23; the isolated bacterial strain of (24) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 24; the isolated bacterial strain of (25) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 25; the isolated bacterial strain of (26) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 26; the isolated bacterial strain of (27) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 27; the isolated bacterial strain of (28) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 28; the isolated bacterial strain of (29) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 29; the isolated bacterial strain of (30) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 30; the isolated bacterial strain of (31) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 31; the isolated bacterial strain of (32) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 32; the isolated bacterial strain of (33) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 33; the isolated bacterial strain of (34) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 34; the isolated bacterial strain of (35) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 35; and the isolated bacterial strain of (36) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 36. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, at least 14, at least 15, at least 16, at least 17, at least 18, at least 19, at least 20, at least 21, at least 22, at least 23, at least 24, at least 25, at least 26, at least 27, at least 28, at least 29, at least 30, at least 31, at least 32, at least 33, at least 34, at least 35, or 36 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises each of the isolated bacterial strains of (1)-(36). In some embodiments, substantially all bacteria in the combination are the isolated bacterial strains of (1)-(36). Some aspects relate to a combination comprising two or more of: an isolated bacterial strain belonging to the genus Coprobacter; an isolated bacterial strain belonging to the genus Phascolarctobacterium; an isolated bacterial strain belonging to the genus Roseburia; an isolated bacterial strain belonging to the genus Dorea; an isolated bacterial strain belonging to the genus Bacteroides; an isolated bacterial strain belonging to the genus Agathobaculum; an isolated bacterial strain belonging to the genus Lawsonibacter; an isolated bacterial strain belonging to the genus Tyzzerella; an isolated bacterial strain belonging to the genus Enorma; an isolated bacterial strain belonging to the genus Faecalimonas; an isolated bacterial strain belonging to the genus Thomasclavelia; an isolated bacterial strain belonging to the genus Clostridium; an isolated bacterial strain belonging to the genus Fournierella; and an isolated bacterial strain belonging to the genus Massilimicrobiota. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 2, at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, or 14 of the genera Coprobacter, Phascolarctobacterium, Roseburia, Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, Enorma, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination comprises one or more of: the isolated bacterial strain belonging to the genus Coprobacter; the isolated bacterial strain belonging to the genus Phascolarctobacterium; and the isolated bacterial strain belonging to the genus Roseburia. In some embodiments, the combination comprises one or more of: the isolated bacterial strain belonging to the genus Dorea; the isolated bacterial strain belonging to the genus Bacteroides; the isolated bacterial strain belonging to the genus Agathobaculum; the isolated bacterial strain belonging to the genus Lawsonibacter; the isolated bacterial strain belonging to the genus Tyzzerella; and the isolated bacterial strain belonging to the genus Enorma. In some embodiments, the combination comprises one or more of: the isolated bacterial strain belonging to the genus Faecalimonas; the isolated bacterial strain belonging to the genus Thomasclavelia; the isolated bacterial strain belonging to the genus Clostridium; the isolated bacterial strain belonging to the genus Fournierella; and the isolated bacterial strain belonging to the genus Massilimicrobiota. In some embodiments, the combination: does not comprise a bacterial strain belonging to the genus Dialister; does not comprise a bacterial strain belonging to the genus Prevotella; does not comprise a bacterial strain belonging to the genus Slackia; does not comprise a bacterial strain belonging to the genus Paraprevotella; does not comprise a bacterial strain belonging to the genus Asaccharobacteria; and / or does not comprise a bacterial strain belonging to the genus Desulfovibrio. In some embodiments, the combination comprises one or more of: an isolated bacterial strain belonging to the species Atopobium minutum; an isolated bacterial strain belonging to the species Bacillus paralicheniformis; an isolated bacterial strain belonging to the species Bacteroides caccae; an isolated bacterial strain belonging to the species Bacteroides cellulosilyticus; an isolated bacterial strain belonging to the species Bacteroides dorei; an isolated bacterial strain belonging to the species Bacteroides fragilis; an isolated bacterial strain belonging to the species Bacteroides ovatus; an isolated bacterial strain belonging to the species Bacteroides thetaiotaomicron; an isolated bacterial strain belonging to the species Bacteroides uniformis; an isolated bacterial strain belonging to the species Bacteroides xylanisolvens; an isolated bacterial strain belonging to the species Barnesiella intestinihominis; an isolated bacterial strain belonging to the species Bifidobacterium adolescentis; an isolated bacterial strain belonging to the species Bifidobacterium pseudocatenulatum; an isolated bacterial strain belonging to the species Bilophila wadsworthia; an isolated bacterial strain belonging to the species Blautia wexlerae; an isolated bacterial strain belonging to the species Butyricicoccus sp.; an isolated bacterial strain belonging to the species Butyricimonas faecihominis; an isolated bacterial strain belonging to the species Clostridium citroniae; an isolated bacterial strain belonging to the species Clostridium innocuum; an isolated bacterial strain belonging to the species Collinsella sp.; an isolated bacterial strain belonging to the species Coprococcus comes; an isolated bacterial strain belonging to the species Eggerthella lenta; an isolated bacterial strain belonging to the species Escherichia coli; an isolated bacterial strain belonging to the species Eubacterium callanderi; an isolated bacterial strain belonging to the species Faecalibacterium prausnitzii; an isolated bacterial strain belonging to the species Faecalicatena orotica; an isolated bacterial strain belonging to the species Hungatella hathewayi; an isolated bacterial strain belonging to the species Odoribacter splanchnicus; an isolated bacterial strain belonging to the species Parabacteroides distasonis; an isolated bacterial strain belonging to the species Parabacteroides merdae; an isolated bacterial strain belonging to the species Paraclostridium bifermentans; an isolated bacterial strain belonging to the species Peptoniphilus harei; an isolated bacterial strain belonging to the species Ruminococcus sp.; and an isolated bacterial strain belonging to the species Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, at least 14, at least 15, at least 16, at least 17, at least 18, at least 19, at least 20, at least 21, at least 22, at least 23, at least 24, at least 25, at least 26, at least 27, at least 28, at least 29, at least 30, at least 31, at least 32, at least 33, or 34 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises one or more isolated bacterial strains collectively comprising one or more 16S rDNA sequences with at least 97% sequence identity to any one of SEQ ID NOs: 520-614. In some embodiments, the combination comprises one or more isolated bacterial strains collectively comprising one or more 16S rDNA sequences with at least 99% sequence identity to any one of SEQ ID NOs: 520-614. In some embodiments, the isolated bacterial strains are lyophilized or spray-dried. Some aspects relate to method of treating an inflammatory bowel disease (IBD) in a subject in need thereof by administering to the subject the combination. In some embodiments, the combination is administered in a therapeutically effective amount to induce proliferation and / or accumulation of regulatory T cells in an intestine of the subject. In some embodiments, one or more of the isolated bacterial strains produce a short- chain fatty acid (SCFA) selected from the group consisting of acetate, butyrate, and propionate. In some embodiments, the combination is a kit comprising the isolated bacterial strains in one or more dosage forms, each dosage form comprising at least one of the isolated bacterial strains of the combination. In some embodiments, the combination is a pharmaceutical composition comprising one or more dosage forms, each dosage form comprising a pharmaceutically acceptable excipient and at least one of the isolated bacterial strains of the combination. In some embodiments, each dosage form is in the form of a capsule. In some embodiments, each dosage form is formulated for oral or rectal delivery. In some embodiments, each dosage form is formulated for oral delivery. In some embodiments, each dosage form is formulated for delivery to the colon. In some embodiments, each dosage form comprises a pH-sensitive composition comprising one or more enteric polymers. In some embodiments, the subject is administered an antibiotic prior to administration of the combination. In some embodiments, the antibiotic is vancomycin. In some embodiments, the IBD is ulcerative colitis or Crohn’s disease. In some embodiments, the IBD is ulcerative colitis. In some embodiments, the subject is a human. In some embodiments, the combination is a food product comprising the isolated bacterial strains and a nutrient. Some aspects of the disclosure relate to a composition comprising a purified bacterial mixture, wherein the purified bacterial mixture comprises two or more bacterial strains belonging to genera selected from the group consisting of Coprobacter, Phascolarctobacterium, and Roseburia. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the purified bacterial mixture comprises at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, at least 14, at least 15, at least 16, at least 17, at least 18, at least 19, at least 20, at least 21, at least 22, at least 23, at least 24, at least 25, at least 26, at least 27, at least 28, at least 29, or at least 30 bacterial strains belonging to genera selected independently from the group consisting of Coprobacter, Phascolarctobacterium, and Roseburia. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the purified bacterial mixture further comprises one or more bacterial strains belonging to genera selected from the group consisting of Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, and Enorma. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the purified bacterial mixture comprises at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, at least 14, at least 15, at least 16, at least 17, at least 18, at least 19, at least 20, at least 21, at least 22, at least 23, at least 24, at least 25, at least 26, at least 27, at least 28, at least 29, or at least 30 bacterial strains belonging to genera selected independently from the group consisting of Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, and Enorma. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the purified bacterial mixture further comprises one or more bacterial strains belonging to genera selected from the group consisting of Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the purified bacterial mixture comprises at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, at least 14, at least 15, at least 16, at least 17, at least 18, at least 19, at least 20, at least 21, at least 22, at least 23, at least 24, at least 25, at least 26, at least 27, at least 28, at least 29, or at least 30 bacterial strains belonging to genera selected independently from the group consisting of Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, (a) at least one strain of the purified bacterial mixture belongs to the genus Coprobacter; (b) at least one strain of the purified bacterial mixture belongs to the genus Phascolarctobacterium; and (c) at least one strain of the purified bacterial mixture belongs to the genus Roseburia. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the composition further comprises: (d) at least one strain of the purified bacterial mixture belonging to the genus Dorea; (e) at least one strain of the purified bacterial mixture belonging to the genus Bacteroides; (f) at least one strain of the purified bacterial mixture belonging to the genus Agathobaculum; (g) at least one strain of the purified bacterial mixture belonging to the genus Lawsonibacter; (h) at least one strain of the purified bacterial mixture belonging to the genus Tyzzerella; and (i) at least one strain of the purified bacterial mixture belonging to the genus Enorma. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, (a) at least one strain of the purified bacterial mixture belongs to the genus Faecalimonas; (b) at least one strain of the purified bacterial mixture belongs to the genus Thomasclavelia; (c) at least one strain of the purified bacterial mixture belongs to the genus Clostridium; (d) at least one strain of the purified bacterial mixture belongs to the genus Fournierella; and (e) at least one strain of the purified bacterial mixture belongs to the genus Massilimicrobiota. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the purified bacterial mixture does not comprise a bacterial strain belonging to the genus Dialister. In some embodiments, the purified bacterial mixture does not comprise a bacterial strain belonging to any of genera Prevotella, Slackia, Paraprevotella, Asaccharobacteria and Desulfovibrio. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some aspects, the disclosure relates to a composition comprising a purified bacterial mixture consisting of two or more bacterial strains belonging to genera selected independently from the group consisting of Coprobacter, Phascolarctobacterium, and Roseburia. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the purified bacterial mixture consists of at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, at least 14, at least 15, at least 16, at least 17, at least 18, at least 19, at least 20, at least 21, at least 22, at least 23, at least 24, at least 25, at least 26, at least 27, at least 28, at least 29, or at least 30 bacterial strains belonging to genera selected independently from the group consisting of Coprobacter, Phascolarctobacterium, and Roseburia. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the bacterial mixture consists of (a) at least one strain belonging to the genus Coprobacter; (b) at least one strain belonging to the genus Phascolarctobacterium; and (c) at least one strain belonging to the genus Roseburia. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some aspects, the disclosure relates to a composition comprising a purified bacterial mixture consisting of two or more bacterial strains belonging to genera selected independently from the group consisting of Coprobacter, Phascolarctobacterium, Roseburia, Dorea, Bacteroides, Coprobacter, Agathobaculum, Lawsonibacter, Tyzzerella, Phascolarctobacterium, and Enorma. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the purified bacterial mixture consists of at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, at least 14, at least 15, at least 16, at least 17, at least 18, at least 19, at least 20, at least 21, at least 22, at least 23, at least 24, at least 25, at least 26, at least 27, at least 28, at least 29, or at least 30 bacterial strains belonging to genera selected independently from the group consisting of Coprobacter, Phascolarctobacterium, Roseburia, Dorea, Bacteroides, Coprobacter, Agathobaculum, Lawsonibacter, Tyzzerella, Phascolarctobacterium, and Enorma. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some aspects, the disclosure relates to a composition comprising a purified bacterial mixture consisting of two or more bacterial strains belonging to genera selected independently from the group consisting of Roseburia, Dorea, Bacteroides, Coprobacter, Agathobaculum, Lawsonibacter, Tyzzerella, Phascolarctobacterium, Enorma, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the purified bacterial mixture consists of at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, at least 14, at least 15, at least 16, at least 17, at least 18, at least 19, at least 20, at least 21, at least 22, at least 23, at least 24, at least 25, at least 26, at least 27, at least 28, at least 29, or at least 30 bacterial strains belonging to genera selected independently from the group consisting of Roseburia, Dorea, Bacteroides, Coprobacter, Agathobaculum, Lawsonibacter, Tyzzerella, Phascolarctobacterium, Enorma, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, (a) at least one strain of the purified bacterial mixture belongs to the genus Coprobacter; (b) at least one strain of the purified bacterial mixture belongs to the genus Phascolarctobacterium; (c) at least one strain of the purified bacterial mixture belongs to the genus Roseburia; (d) at least one strain of the purified bacterial mixture belongs to the genus Dorea; (e) at least one strain of the purified bacterial mixture belongs to the genus Bacteroides; (f) at least one strain of the purified bacterial mixture belongs to the genus Agathobaculum; (g) at least one strain of the purified bacterial mixture belongs to the genus Lawsonibacter; (h) at least one strain of the purified bacterial mixture belongs to the genus Tyzzerella; and (i) at least one strain of the purified bacterial mixture belongs to the genus Enorma. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, (a) at least one strain of the purified bacterial mixture belongs to the genus Faecalimonas; (b) at least one strain of the purified bacterial mixture belongs to the genus Thomasclavelia; (c) at least one strain of the purified bacterial mixture belongs to the genus Clostridium; (d) at least one strain of the purified bacterial mixture belongs to the genus Fournierella; and (e) at least one strain of the purified bacterial mixture belongs to the genus Massilimicrobiota. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the purified bacterial mixture further comprises one or more bacterial strains belonging to species selected from the group consisting of Bacteroides caccae, Bacteroides intestinalis, Bacteroides faecis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides vulgatus, Bifidobacterium adolescentis, Bifidobacterium longum, Bifidobacterium pseudocatenulatum, Blautia producta, Clostridium citroniae, Clostridium clostridioforme, Clostridium innocuum, Paeniclostridium sordellii, Coprococcus comes, Dorea longicatena, Erysipelatoclostridium ramosum, Eubacterium rectale, Odoribacter sp., Parabacteroides distasonis, Parabacteroides merdae, Bacteroides xylanisolvens, Blautia obeum, Alistipes putredinis, Collinsella aerofaciens, Eubacterium hallii, Alistipes shahii, Anaerostipes caccae, Phascolarctobacterium faecium, Agathobaculum butyriciproducens, Bacteroides fragilis, Fusobacterium mortiferum, Paraclostridium bifermentans, and Escherichia coli. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the purified bacterial mixture further comprises 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, or 36 bacterial strains belonging to species selected from the group consisting of Bacteroides caccae, Bacteroides intestinalis, Bacteroides faecis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides vulgatus, Bifidobacterium adolescentis, Bifidobacterium longum, Bifidobacterium pseudocatenulatum, Blautia producta, Clostridium citroniae, Clostridium clostridioforme, Clostridium innocuum, Paeniclostridium sordellii, Coprococcus comes, Dorea longicatena, Erysipelatoclostridium ramosum, Eubacterium rectale, Odoribacter sp., Parabacteroides distasonis, Parabacteroides merdae, Bacteroides xylanisolvens, Blautia obeum, Alistipes putredinis, Collinsella aerofaciens, Eubacterium hallii, Alistipes shahii, Anaerostipes caccae, Phascolarctobacterium faecium, Agathobaculum butyriciproducens, Bacteroides fragilis, Fusobacterium mortiferum, Paraclostridium bifermentans, and Escherichia coli. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the purified bacterial mixture further comprises 36 bacterial strains belonging to species selected from the group consisting of Bacteroides caccae, Bacteroides intestinalis, Bacteroides faecis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides vulgatus, Bifidobacterium adolescentis, Bifidobacterium longum, Bifidobacterium pseudocatenulatum, Blautia producta, Clostridium citroniae, Clostridium clostridioforme, Clostridium innocuum, Paeniclostridium sordellii, Coprococcus comes, Dorea longicatena, Erysipelatoclostridium ramosum, Eubacterium rectale, Odoribacter sp., Parabacteroides distasonis, Parabacteroides merdae, Bacteroides xylanisolvens, Blautia obeum, Alistipes putredinis, Collinsella aerofaciens, Eubacterium hallii, Alistipes shahii, Anaerostipes caccae, Phascolarctobacterium faecium, Agathobaculum butyriciproducens, Bacteroides fragilis, Fusobacterium mortiferum, Paraclostridium bifermentans, and Escherichia coli. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the purified bacterial mixture further comprises one or more additional bacterial strains, each of the additional bacterial strains comprising a 16S rDNA sequence with at least 97% sequence identity to a nucleic acid sequence of any one of SEQ ID NOs: 1-36. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the purified bacterial mixture further comprises 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, or 36 bacterial strains, each of the additional bacterial strains comprising a 16S rDNA sequence with at least 97% sequence identity to a nucleic acid sequence selected independently from the group consisting of SEQ ID NOs: 1-36. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the purified bacterial mixture further comprises 36 bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to the nucleic acid sequences of SEQ ID NOs: 1-36. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, one or more of the bacterial strains produce a short chain fatty acid (SCFA). In some embodiments, one or more of the bacterial strains produce acetate, butyrate, and / or propionate. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the bacterial strains are lyophilized. In some embodiments, the bacterial strains are spray-dried. In some embodiments, one or more of the bacterial strains are in spore form. In some embodiments, each of the bacterial strains are in spore form. In some embodiments, one or more of the bacterial strains are in vegetative form. In some embodiments, each of the bacterial strains is in vegetative form. In some embodiments, the purified bacterial mixture induces proliferation and / or accumulation of regulatory T (Treg) cells. In some aspects, the disclosure relates to a pharmaceutical composition comprising a composition as described herein, and a pharmaceutically acceptable excipient. In some embodiments, the pharmaceutical composition induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the pharmaceutical composition is formulated for oral delivery. In some embodiments, the pharmaceutical composition is formulated for rectal delivery. In some embodiments, the pharmaceutical composition is formulated for delivery to the intestine. In some embodiments, the pharmaceutical composition is formulated for delivery to the colon. In some embodiments, the pharmaceutical composition comprises one or more enteric polymers. In some embodiments, the pharmaceutical composition induces proliferation and / or accumulation of regulatory T (Treg) cells. In some embodiments, the pharmaceutical composition is in a capsule. In some embodiments, the capsule comprises 1x107to 1x1010colony-forming units (CFUs) of the bacterial strains. In some embodiments, the pharmaceutical composition induces proliferation and / or accumulation of regulatory T (Treg) cells. In some aspects, the disclosure relates to a food product comprising a composition as described herein, and a nutrient. In some embodiments, the food product induces proliferation and / or accumulation of regulatory T (Treg) cells. In some aspects, the disclosure relates to a method comprising administering a composition, pharmaceutical composition, or food product as described herein, to a subject in need thereof. In some embodiments, the subject has an autoimmune, allergic, or inflammatory disease. In some embodiments, the composition, pharmaceutical composition, or food product is administered in a therapeutically effective amount to treat inflammatory bowel disease in the subject. In some embodiments, the composition, pharmaceutical composition, or food product is administered in a therapeutically effective amount to treat ulcerative colitis in the subject. In some embodiments, the composition, pharmaceutical composition, or food product is administered as one dose. In some embodiments, the composition, pharmaceutical composition, or food product is administered as multiple doses. In some embodiments, each dose of the composition comprises administration of multiple capsules. In some embodiments, the subject is administered an antibiotic prior to administration of the composition, pharmaceutical composition, or food product. In some embodiments, the antibiotic is selected from the group consisting of kanamycin, gentamicin, colistin, metronidazole, vancomycin, clindamycin, fidaxomicin, penicillin, streptomycin, and cefoperazone. In some embodiments, the antibiotic is vancomycin. In some embodiments, the composition, pharmaceutical composition, or food product induces the proliferation and / or accumulation of regulatory T (Treg) cells in the subject. In some embodiments, the subject is a human. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which constitute a part of this specification, illustrate several embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure. FIG.1 is a timeline of a human fecal microbiota transplant (FMT) study. Twenty-four patients were randomized into Budesonide and Placebo treatment groups. Patients then received a bowel lavage, followed by 4 FMT infusions (weeks 3 to 6). The “Acute Engraftment” time period for assessing engraftment is defined from weeks 4-7 which corresponds to samples collected one week after each FMT. The “Durable Engraftment” time period is defined by samples collected 2 weeks or later following the final FMT infusion (weeks 8 to week 14). FMT = fecal microbiota transplantation, n=number. FIGs.2A-2F show the effect of pre-treatment and donor on clinical outcome. FIG. 2A shows the clinical outcomes at week 10. The effect of pre-treatment, in FIG.2B, and donors, FIG.2C, in the (partial) responder group at week 10 is described from FIGs.2B-2C. FIG.2D shows the clinical outcomes of week 14. The effect of pre-treatment, in FIG.2E, and donors, in FIG.2F, in the (partial) responder group at week 14 is described from FIGs. 2E-2F. FIGs.3A-3C show the microbiota community differences among FMT donors. Differences in microbial diversity between D07 and D08 samples as number of observed species (FIG.3A), and Shannon index (FIG.3B) demonstrate that D07 has higher diversity than D08 (p<0.05). FIG.3C shows the microbiota community differences between D07 and D08 samples. Clusters were significantly different by PERMANOVA (p=0.001). Thirteen donor samples from D07 and 14 samples from D08 were collected between June 2017 to July 2019. FIGs.4A-4E show the total engraftment of donor microbiome. To test for association between bacterial engraftment and pretreatment, donor or clinical response, a single engraftment score was calculated by combining metrics using species abundance, number of species, and species composition. The weighted sum of these three metrics was then used as the total engraftment score. Donor D07 was correlated with higher acute, durable, and overall engraftment (P < 0.05; Wilcoxon rank sum exact test). FIG.4A shows engraftment stratified by budesonide pre-treatment. FIG.4B shows the engraftment stratified by donor. FIG.4C shows engraftment stratified by response at 10 weeks post-FMT. FIG.4D shows engraftment stratified by response at 14 weeks post-FMT. FIG.4E is the visualized the impact of budesonide pre-treatment on engraftment while controlling for donor. Acute = one week after each FMT; Durable = 2-8 weeks after final FMT; Overall = from 1 week after the first FMT up to 2 months after FMT. FIGs.5A and 5B show the taxonomic associations with FMT response. Relative abundances of genera in longitudinal samples of recipients that are most predictive in discriminating between responders (blue points & solid lines) and non-responders (orange points & solid lines) determined from the random forest classification (RFC) model. The solid lines represent the median relative abundances in responders and non-responder groups with relative abundances from individuals as lighter points. The red dashed lines in each panel highlight the most discriminative time point and the model identified threshold determined by Model 3 consisting of Baseline + FMT + Week-7 + Week-8 samples only (FIG.5A) and Model 4 consisting of all timepoints up to Week 14 (FIG.5B). FIGs.6A-6G show selection of fecal microbiota transplant donors. FIG.6A is a heatmap depicting the mean relative abundance of taxa at the family level in stool samples from 12 healthy FMT donors. The donors are clustered based on their fecal microbiota composition. The donors selected for further evaluation based on their microbiota composition and donor availability are indicated by the filled in circles and correspond with FIG.6B. FIGs.6B-6D show donor stool induces T regulatory cells in the colonic lamina propria of mice. Germ-free mice were given either pooled (total + ethanol treated), spore- forming fraction (ethanol treated), or total stool fraction libraries (SFL). Four weeks post- treatment, induced T regulatory cells in the colonic lamina propria were examined by flow cytometry (gating: lymphocytes ^singlets Live CD45+ CD4+ CD3+ ^ Foxp3 vs. Helios). FIG.6B shows total SFLs from donors D09, D05, and D07 significantly induced T regulatory cells (Foxp3+ Helios-) when compared to germ-free control mice. n=4-6 mice per group. FIGs.6C-6D show induction of T regulatory cells by pooled, total, and spore forming SFLs from D07 (FIG.6C) and D08 (FIG.6D). n=4-6 mice per group. FIGs.6E-6G show short-chain fatty acids from cecal contents were measured by mass spectrometry. Acetate (FIG.6E), propionate (FIG.6F), and butyrate (FIG.6G) were quantified. Each figure shows the P-values of Kruskal-Wallis test with an Uncorrected Dunn’s multiple comparisons between two differently colored groups. FIGs.7A-7C show median Species Engraftment Index (SEI), Species Engraftment Fraction (SEF), and Aitchison similarity to donor scores compared between budesonide and placebo-treated patients. FIG.7A shows the median SEI, FIG.7B shows SEF, and FIG.7C shows Aitchison similarity. Each figure shows the P-values of Wilcoxon rank sum exact tests between the two differently colored groups. FIGs.8A-8C show Total Species Engraftment Index, Species Engraftment Fraction (SEF), and Aitchison similarity to donor scores compared between patients treated with microbiota from D07 and D08. FIG.8A shows median SEI is not different between patients treated with FMT from donors D07 and D08 (P > 0.05). FIG.8B shows SEF (all timeframes), and FIG.8C shows normalized Aitchison distances (acute and durable, but not overall). Each figure shows the P-values of Wilcoxon rank sum exact tests between the two differently colored groups. FIGs.9A-9C show Total Species Engraftment Index, Species Engraftment Fraction (SEF), and Aitchison similarity to donor scores compared between patients with a good clinical response and those with no positive clinical outcome at week 10 (4 weeks after FMT). FIG.9A shows Median SEI, FIG.9B shows number of engrafted species (SEF), and FIG.9C shows the similarity to the donor’s bacterial composition (Aitchison similarity). Each figure shows the P-values of Wilcoxon rank sum exact tests between the two differently colored groups. FIGs.10A-10C show Total Species Engraftment Index (FIG.10A), Species Engraftment Fraction (SEF) (FIG.10B), and Aitchison similarity (FIG.10C) to donor scores compared between patients with a good clinical response and those with no positive clinical outcome at week 14 (8 weeks after FMT). FIGs.11A-11C show a model comparison performance. FIG.11A shows the classification performance estimated as Area Under the Curve and F1-score (harmonic mean between precision and recall) was determined for different RFC models corresponding to different combinations between time points and microbiome abundance aggregated at different taxonomic levels. The following models were used: baseline samples only (model 1); baseline and post FMT samples (model 2); baseline, post FMT and week 7&8 (model 3); all timepoints up to week 14 (model 4). FIG.11B shows permutated variable importance for the most predictive model (Model 3 with Genus-level aggregation), identifying the genera (e.g., Roseburia, and Dorea) and timepoint as most predictive of outcome post-FMT. FIG. 11C shows similar analysis is displayed for Model 4 with abundance aggregated at the Genus level. LOOCV = leave one out cross validation. FIG.12 depicts the experimental setup of IL-10-eGFP reporter mice tested for de- colonization by D08 Stool Fraction Library (SFL) in a Simplified Human Microbiome (SIHUMI) plus Klebsiella pneumoniae (Kpn) (SIHUMI+K) model. FIG.13 shows the preliminary efficacy of D08 SFL the SIHUMI+K model. Addition of non-spore-forming (NS) stool fraction library (SFL) derived from donor D17014 (D08 SFL) lead to induction of an anti-inflammatory IL-10 response in SIHUMI+K-colonized mice. FIGs.14A-14C show that D08 SFL effectively decolonizes pro-inflammatory K. pneumoniae (FIG.14A), Enterococcus (FIG.14B), and E. coli (FIG.14C) taxa in non- inflamed IL-10-eGFP mice. FIGs.15A-15E show the 36-mix suppresses SIHUMI + K-induced colitis. FIG.15A shows a timeline of SIHUMI+K colitis induction, live bacterial product (LBP) treatment, or PBS control administration, and evaluation at week 6 post colitis-induction. FIG.15B shows histology of ileum (Ile), cecum (Ce), proximate colon (Pc), distal colon (Dc), rectum (Re), or combined Ce+Pc+Re. FIG.15C shows frequency of FoxP3+ (Treg) cells among CD4+ T cells. FIG.15D shows frequency of IFN-γ-producing (Th1) T cells among CD4+ T cells. FIG.15E shows frequency of IFN-γ- and IL-17A-producting (Th17) T cells among CD4+ T cells. FIGs.16A-16C show that D08 SFL and the 36-mix induce anti-inflammatory IL-10+ T cells in IL-10 GFP reporter mice colonized with colitis-inducing SIHUMI+K consortium. Flow data from a first experiment (using D08 SFL) and a second experiment (using 36-mix) were combined and shown. FIG.16A shows frequency of IL-10-producing cells among CD4+ T cells. FIG.16B shows frequency of FoxP3+ (Treg) cells among CD4+ T cells. FIG. 16C shows frequency of RORγt+FoxP3+CD4+ T cells. FMO: Fluorescence minus one (for GFP-gate). Mann Whitney test was used. *p<0.05, **p<0.01, ****p<0.0001. FIGs.17A and 17B show the 36-mix suppresses SIHUMIK-induced colitis in IL- 10KO mice. FIG.17A shows representative histology slides of cecum and rectum, at Week 6 post-colitis induction, and stained with H&E. Magnification x100, bar indicates 100 µm. FIG.17B are the histology scores of ileum end (Ile), cecum (Ce), proximal colon (Pc), distal colon (Dc), rectum (Re), and combined, scored in a blinded fashion. Mann-Whitney test, two- tailed unpaired t test. *p < 0.05. FIG.18 shows the 36-mix fully decolonizes pathogenic Klebsiella in the intestine, even in an inflammatory background. Absence of IL-10 (IL-10 - / -) promotes inflammation due to the absence of immunosuppressive cells. FIGs.19A and 19B show partial decolonization of E. faecalis by the 36-mix. FIG. 19A shows decolonization by the 36-mix. FIG.19B shows decolonization by D08 SFL. FIGs.20A and 20B show decolonization of AIEC LF82 E. coli. FIG.20A shows total E. coli. FIG.20B shows differentiated E. coli (strain 36 of the 36-mix v. AIEC LF82 E. coli). FIG.21 shows a timeline of an in vivo study comparing the 36-mix and D08 SFL in a mouse model of SIHUMI+K colitis. FIGs.22A-22C show results of D08 or the 36-mix administration in SIHUMI+K- induced colitis in IL-10KO mice. Both D08 SFL and 36 mix attenuated SIHUMIK-induced colitis in IL-10KO mice. FIG.22A depicts the experimental design. Swab colonization for aerobic bacteria colonization; gavage colonization for anaerobic bacteria. FIG.22B shows representative histology pictures of cecum and rectum at week 6 post-colitis induction with H&E staining, magnification x100, bar indicates 100 µm. FIG.22C show the histology scores of ileum end (Ile), cecum (Ce), proximal colon (Pc), distal colon (Dc), rectum (Re), and combined, scored in a blinded fashion. Mann-Whitney test, two-tailed unpaired t test. *p < 0.05, **p < 0.01, ***p < 0.001. FIGs.23A and 23B show activity against Kp2H7 (FIG.23A) or E. faecalis (FIG. 23B) by D08 SFL or 36-mix. Dashed line represents limit of detection (L.o.D.). FIGs.24A-24C show effects on E. coli colonization by D08 SFL vs. the 36-mix. FIG.24A shows total undifferentiated E. coli. FIG.24B shows abundance of AIEC LF82 E. coli. FIG.24C shows abundance of Strain 36 of the 36-mix E. coli. FIG.25 shows that D08 SFL and the 36-mix suppress inflammatory markers (IL12p40, left panel; Lcn2, right panel) in supernatants of colonic strip cultures. FIG.26 shows abundance of the indicated T cell subpopulations in lamina propria in SIHUMI+K-induced colitis in IL-10KO mice administered D08 SFL, 36-mix, or PBS + glycerol control. Tukey’s multiple comparisons test. *p < 0.05, **p < 0.01. FIG.27 shows induction of IFN-γ production by colonic lamina propria (LP) cells of mice administered D08 SFL or the 36-mix, following culture with E. coli (left panel) and K. pneumonia (right panel) lysates. FIG.28 shows induction of IL-17A production by colonic lamina propria (LP) cells of mice administered D08 SFL or the 36-mix, following culture with E. coli (left panel) and K. pneumonia (right panel) lysates. FIG.29 shows induction of IFN-γ production by colonic lamina propria (LP) cells of mice administered D08 SFL or the 36-mix, following culture with the indicated bacterial lysates. FIG.30 shows induction of IL-17A production by colonic lamina propria (LP) cells of mice administered D08 SFL or the 36-mix, following culture with the indicated bacterial lysates. FIGs.31A-31C show that SIHUMI+K consortium induces colitis in IL-10KO mice and adding Kp2H7 increases virulence potential. FIG.31A shows a timeline of SIHUMI+K colitis induction and fecal pellet monitoring. FIG.31B shows lipocalin-2 (Lcn) concentration in fecal pellets (f-Lcn). FIG.31C shows histologic scores in WT or IL-10KO 129 or B6 mice at 12-weeks post-administration of SIHUMI. FIG.32 shows that the SIHUMI+K consortium induces inflammatory cells (%IFNγ+ , left panel; %IL-17A+, middle panel; %Foxp3+, right panel) in the colonic lamina propria. BacX-WT: Reference control. FIGs.33A-33D show SCFA production by individual strains of the 36-mix (VE736-1 through VE736-36) or control strains (Strains 1-4). FIG.33A shows acetic acid production. FIG.33B shows formic acid production. FIG.33C shows propanoic acid production. FIG. 33D shows butanoic acid production. FIGs.34A-34C show indole-containing compound production by individual strains of the 36-mix (VE736-1 through VE736-36) or control strains (Strains 1-4). FIG.34A shows indole production. FIG.34B shows indole-3-pyruvic acid / indole-3-acetic acid production. FIG.34C shows indole-3-acrylic acid production. DETAILED DESCRIPTION Aspects of the disclosure relate to combinations of bacterial strains that are useful, e.g., for treating and / or preventing inflammatory bowel disease (IBD), such as ulcerative colitis (UC). Administration of donor stool fractions yielded substantial improvement in IBD symptoms, as well as Treg induction and production of short-chain fatty acids (SCFAs) in human subjects, with analysis of microbial community compositions in donor stool fractions revealing bacterial taxa associated with alleviation (response) or lack of alleviated IBD symptoms (non-response). Moreover, a defined bacterial consortium of strains obtained from the same human donor similarly improved IBD symptoms in an in vivo colitis model and also induced Treg accumulation and SCFA production in vivo. Compositions containing such bacterial taxa, and methods of using the same, are thus useful, for example, in alleviating IBD symptoms, inducing Treg proliferation and / or accumulation, and / or inducing SCFA production in vivo. This disclosure is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the drawings. The disclosure is capable of other embodiments and of being practiced or of being carried out in various ways. Also, the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having,” “containing,” “involving,” and variations thereof herein, is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Microbiomes are present, for example in mammalian subjects, on the skin, within the gastrointestinal tract (i.e., the gut), within the oral cavity, and within the vaginal tract of female subjects, and comprise bacteria, archaea, protists, fungi, and viruses. In some instances, the species present in a microbiome benefit the subject by performing useful or necessary functions, such as aiding in the digestion of food in the intestinal tract of the subject, protecting the body from penetration by pathogenic microbes, and promoting immunological development. Organisms within the microbiota that perform these functions may be referred to as symbiotic or commensal organisms because they exist in the subject without harming and, in some cases, actually benefit the host. In dysbiosis, a state of imbalance of the microbiome of a subject, the normal microbiome of the subject is perturbed or damaged, which may lead to a variety of diseases and / or disorders. In some embodiments, the species that normally dominate the microbiome become underrepresented (e.g., commensal or symbiotic species) and species which are normally underrepresented (e.g., opportunistic species) become overrepresented. See also, e.g., Petersen et al., “Defining dysbiosis and its influence on host immunity and disease.” Cell Microbiol. (2014) 16(7):1024-1033. Bacterial combinations and compositions thereof Some aspects of the disclosure relate to combinations of isolated bacterial strains. Some embodiments relate to compositions comprising a isolated bacterial mixture comprising two or more bacterial strains. In some embodiments, the composition is a combination product. “Combination product”, as used herein, has the definition specified in 21 CFR 3.2(e). At the time of filing the instant specification, “combination product” defined under 21 CFR 3.2(e) includes: (1) A product comprised of two or more regulated components, i.e., drug / device, biologic / device, drug / biologic, or drug / device / biologic, that are physically, chemically, or otherwise combined or mixed and produced as a single entity; (2) Two or more separate products packaged together in a single package or as a unit and comprised of drug and device products, device and biological products, or biological and drug products; (3) A drug, device, or biological product packaged separately that according to its investigational plan or proposed labeling is intended for use only with an approved individually specified drug, device, or biological product where both are required to achieve the intended use, indication, or effect and where upon approval of the proposed product the labeling of the approved product would need to be changed, e.g., to reflect a change in intended use, dosage form, strength, route of administration, or significant change in dose; or (4) Any investigational drug, device, or biological product packaged separately that according to its proposed labeling is for use only with another individually specified investigational drug, device, or biological product where both are required to achieve the intended use, indication, or effect. Some embodiments relate to methods of administering a composition comprising a combination of isolated bacterial strains. Some embodiments relate to methods of administering a combination of isolated bacterial strains to a subject. Some embodiments relate to kits comprising a combination of isolated bacterial strains. The skilled artisan will appreciate that because bacterial strains may engraft in the gastrointestinal tract of a subject, it is not necessary that all bacterial strains administered to the subject be present in a single dosage form (e.g., a single capsule comprising all bacterial strains of the combination). In general, bacterial strains may be classified phylogenetically with other closely related strains and species based on their 16S rRNA (or 16S rDNA) nucleic acid sequence. Methods for determining the identity of specific bacterial species based on their 16S rRNA (or 16S rDNA) nucleic acid sequence are well known in the art (See, e.g., Jumpstart Consortium Human Microbiome Project Data Generation Working, G. PLoS One.2012. 7:e39315). Bacteria with 16S rRNA or rDNA sequences with greater than 97% sequence identity are typically assigned to the same species, and those with greater than 95% identity are typically assigned to the same genus. Schloss & Handelsman, Appl Environ Micribiol. 2005.71(3):1501-1506. See also Yarza et al., Syst Appl Microbiol.2008.31(4):241-250. As used herein, a “species cluster” refers to a group of genomes (and / or a group of bacteria comprising the genomes) defined by a representative genome and an ANI circumscription radius, as described in Parks et al., 2020. Nat Biotechnol.38(9):1079-1086. Names of species clusters referenced herein are to be understood as those of GTDB Release 220 (release date: April 24, 2024), with corresponding ANI circumscription radii provided in Release 220. In evaluating whether a Query bacterium’s genome (e.g., as recited in a claim) belongs to a particular species cluster (e.g., as listed in Table 1), the skilled artisan may use the Genome Taxonomy Database Toolkit (GTDB-Tk) to assign the Query bacterium’s genome to a species cluster. See, e.g., Chaumeil et al., Bioinformatics.2020.36(6):1925- 1927, which is incorporated by reference herein to the extent it describes assignment of genomes to GTDB species clusters. For example, the genome having Accession No. GCA_023008365.1 is assigned to the species cluster Sellimonas intestinalis on the basis of similarity to the representative genome having Accession No. GCA_001280875.1. Because GTDB-Tk also identifies a Query genome as belonging to a particular genus, the skilled artisan may also compare the Query genome to each genome assigned to the genus, to determine the closest intragenus genome to the Query genome, and the corresponding species cluster of the closest intragenus genome. The skilled artisan will also appreciate that a Query genome must meet the following criteria to be suitable for assignment to a species cluster: (i) CheckM completeness estimate >50%; (ii) CheckM contamination estimate <10%; (iii) quality score, defined as Completeness - 5*Contamination, >50; (iv) contain >40% of the bac120 or ar53 marker genes; (v) contain <1000 contigs; (vi) have an N50 >5kb; and (vii) contain <100,000 ambiguous bases. Where a species cluster includes a genome of a type strain of a species that is validly published under the International Code of Nomenclature of Prokaryotes (ICNP), the skilled artisan may also identify a bacterium as belonging to the validly published species by comparing the characteristics of the bacterium to the published description of that species. For example, the description of Sellimonas intestinalis is set forth in the valid publication of Seo et al., Int J Syst Evol Microbiol.2016.66(2):951-956, which describes phenotypic characteristics that differentiate the type strain BR72Tof species Sellimonas intestinalis from bacteria of other genera and species in the family Lacchnospiraceae. If the bacterium’s properties are consistent with the published description of the species, the skilled artisan can reasonably conclude that the bacterium’s genome belongs to the species cluster corresponding to the validly published species. It should be appreciated that the terms “bacteria” and “bacterial strains” as used herein are interchangeable. The compositions described herein containing multiple bacterial strains may also be referred to as “live bacterial products” or “live biotherapeutic products.” Genera and species of bacterial strains Some aspects relate to combinations comprising two or more isolated bacterial strains that collectively belong to two or more of the genera Coprobacter, Phascolarctobacterium, Roseburia, Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, Enorma, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. Genus names, as used herein, include bacteria classified using the following genus names in the Genome Taxonomy Database (GTDB), Release 220: Phascolarctobacterium includes bacterial strains classified as Phascolarctobacterium and Phascolarctobacterium_A; Roseburia includes bacterial strains classified as Roseburia, Roseburia_A, Roseburia_B, Roseburia_C, and Roseburia_D; Dorea includes bacterial strains classified as Dorea, Dorea_A, Dorea_B, and Dorea_D; Bacteroides includes bacterial strains classified as Bacteroides, Bacteroides_D, Bacteroides_E, Bacteroides_F, Bacteroides_G, Bacteroides_H, and Bacteroides_I; Lawsonibacter includes bacterial strains classified as Lawsonibacter and Lawsonibacter_A; and Clostridium includes bacterial strains classified as Clostridium, Clostridium_A, Clostridium_AA, Clostridium_AB, Clostridium_AC, Clostridium_AD, Clostridium_AE, Clostridium_AF, Clostridium_AG, Clostridium_AH, Clostridium_AI, Clostridium_AK, Clostridium_AM, Clostridium_AN, Clostridium_AO, Clostridium_AP, Clostridium_AQ, Clostridium_AR, Clostridium_AS, Clostridium_AT, Clostridium_AU, Clostridium_AV, Clostridium_AW, Clostridium_B, Clostridium_C, Clostridium_D, Clostridium_E, Clostridium_F, Clostridium_G, Clostridium_H, Clostridium_I, Clostridium_J, Clostridium_K, Clostridium_L, Clostridium_N, Clostridium_R, Clostridium_S, Clostridium_T, Clostridium_W, Clostridium_X, Clostridium_Y, and Clostridium_Z. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 3 or more of the genera Coprobacter, Phascolarctobacterium, Roseburia, Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, Enorma, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 4 or more of the genera Coprobacter, Phascolarctobacterium, Roseburia, Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, Enorma, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 5 or more of the genera Coprobacter, Phascolarctobacterium, Roseburia, Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, Enorma, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 6 or more of the genera Coprobacter, Phascolarctobacterium, Roseburia, Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, Enorma, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 7 or more of the genera Coprobacter, Phascolarctobacterium, Roseburia, Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, Enorma, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 8 or more of the genera Coprobacter, Phascolarctobacterium, Roseburia, Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, Enorma, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 9 or more of the genera Coprobacter, Phascolarctobacterium, Roseburia, Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, Enorma, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 10 or more of the genera Coprobacter, Phascolarctobacterium, Roseburia, Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, Enorma, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 11 or more of the genera Coprobacter, Phascolarctobacterium, Roseburia, Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, Enorma, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 12 or more of the genera Coprobacter, Phascolarctobacterium, Roseburia, Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, Enorma, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 13 or more of the genera Coprobacter, Phascolarctobacterium, Roseburia, Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, Enorma, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to all 14 of the genera Coprobacter, Phascolarctobacterium, Roseburia, Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, Enorma, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to one or more of the genera Coprobacter, Phascolarctobacterium, Roseburia. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 2 or more of the genera Coprobacter, Phascolarctobacterium, Roseburia. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to all 3 of the genera Coprobacter, Phascolarctobacterium, Roseburia. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to one or more of the genera Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, and Enorma. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 2 or more of the genera Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, and Enorma. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 3 or more of the genera Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, and Enorma. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 4 or more of the genera Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, and Enorma. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 5 or more of the genera Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, and Enorma. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to all 6 of the genera Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, and Enorma. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to one or more of the genera Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 2 or more of the genera Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 3 or more of the genera Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to 4 or more of the genera Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to all 5 of the genera Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination lacks bacterial strains of one or more of the genera Dialister, Prevotella, Slackia, Paraprevotella, Asaccharobacteria, and Desulfovibrio. In some embodiments, the combination does not comprise a bacterial strain belonging to the genus Dialister. In some embodiments, the combination does not comprise a bacterial strain belonging to the genus Prevotella. In some embodiments, the combination does not comprise a bacterial strain belonging to the genus Slackia. In some embodiments, the combination does not comprise a bacterial strain belonging to the genus Paraprevotella. In some embodiments, the combination does not comprise a bacterial strain belonging to the genus Asaccharobacteria. In some embodiments, the combination does not comprise a bacterial strain belonging to the genus Desulfovibrio. In some embodiments, the combination comprises one or more isolated bacterial strains that collectively belong to at least one of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 2 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 3 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 4 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 5 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 6 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 7 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 8 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 9 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 10 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 11 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 12 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 13 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 14 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 15 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 16 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 17 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 18 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 19 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 20 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 21 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 22 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 23 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 24 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 25 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 26 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 27 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 28 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 29 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 30 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 31 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 32 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to at least 33 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises isolated bacterial strains that collectively belong to all 34 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. Some aspects of the disclosure relate to combinations comprising at least 2 bacterial strains (e.g., 2, 3, 4, 5, or more) belonging to genera independently selected from Coprobacter, Phascolarctobacterium, and Roseburia. In some embodiments, the combination comprises a bacterial strain belonging to the genus Coprobacter. In some embodiments, the combination further comprises a bacterial strain belonging to the genus Phascolarctobacterium. In some embodiments, the combination further comprises a bacterial strain belonging to the genus Roseburia. In some embodiments, the combination comprises a bacterial strain belonging to the genus Coprobacter and a bacterial strain belonging to the genus Phascolarctobacterium. In some embodiments, the combination comprises a bacterial strain belonging to the genus Coprobacter and a bacterial strain belonging to the genus Roseburia. In some embodiments, the combination comprises a bacterial strain belonging to the genus Phascolarctobacterium and a bacterial strain belonging to the genus Roseburia. In some embodiments, the combination comprises a bacterial strain belonging to the genus Coprobacter, a bacterial strain belonging to the genus Phascolarctobacterium, and a bacterial strain belonging to the genus Roseburia. In some embodiments, the combination further comprises at least 1 (e.g., 1, 2, 3, 4, 5, or more) bacterial strains belonging to genera independently selected from Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, and Enorma. For example, in some embodiments, the combination further comprises a bacterial strain belonging to the genus Dorea. In some embodiments, the combination further comprises a bacterial strain belonging to the genus Bacteroides. In some embodiments, the combination further comprises a bacterial strain belonging to the genus Agathobaculum. In some embodiments, the combination further comprises a bacterial strain belonging to the genus Lawsonibacter. In some embodiments, the combination further comprises a bacterial strain belonging to the genus Tyzzerella. In some embodiments, the combination further comprises a bacterial strain belonging to the genus Enorma. In some embodiments, the combination further comprises bacterial strains belonging to two genera independently selected from Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, and Enorma. In some embodiments, the combination further comprises bacterial strains belonging to three genera independently selected from Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, and Enorma. In some embodiments, the combination further comprises bacterial strains belonging to four genera independently selected from Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, and Enorma. In some embodiments, the combination further comprises bacterial strains belonging to five genera independently selected from Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, and Enorma. In some embodiments, the combination further comprises bacterial strains belonging to six genera independently selected from Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, and Enorma. In some embodiments, the combination further comprises (i) at least one bacterial strain belonging to the genus Dorea; (ii) at least one bacterial strain belonging to the genus Bacteroides; (iii) at least one bacterial strain belonging to the genus; (iv) at least one bacterial strain belonging to the genus Agathobaculum; (iv) at least one bacterial strain belonging to the genus Lawsonibacter; (v) at least one bacterial strain belonging to the genus Tyzzerella; and (vi) at least one bacterial strain belonging to the genus Enorma. In some embodiments, the combination further comprises at least 1 (e.g., 1, 2, 3, 4, 5, or more) bacterial strains belonging to genera independently selected from Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. For example, in some embodiments, the combination further comprises a bacterial strain belonging to the genus Faecalimonas. In some embodiments, the combination further comprises a bacterial strain belonging to the genus Thomasclavelia. In some embodiments, the combination further comprises a bacterial strain belonging to the genus Clostridium. In some embodiments, the combination further comprises a bacterial strain belonging to the genus Fournierella. In some embodiments, the combination further comprises a bacterial strain belonging to the genus Massilimicrobiota. In some embodiments, the combination further comprises bacterial strains belonging to two genera independently selected from Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination further comprises bacterial strains belonging to three genera independently selected from Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination further comprises bacterial strains belonging to four genera independently selected from Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota. In some embodiments, the combination further comprises (i) at least one bacterial strain belonging to the genus Faecalimonas; (ii) at least one bacterial strain belonging to the genus Thomasclavelia; (iii) at least one bacterial strain belonging to the genus Clostridium; (iv) at least one bacterial strain belonging to the genus Fournierella; and (v) at least one bacterial strain belonging to the genus Massilimicrobiota. In some embodiments, the combination comprises one or more bacterial strains belonging to the genus Coprobacter. A combination comprising a bacterial strain of a species may include any number of bacterial strains belonging to that genus. Similarly, a combination comprising a bacterial strain of a species may include any number of bacterial strains belonging to that species. For example, a combination comprising one or more strains belonging to Coprobacter may comprise 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the genus Coprobacter. In some embodiments, the combination comprises one or more bacterial strains belonging to the genus Phascolarctobacterium. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the genus Phascolarctobacterium. In some embodiments, the combination comprises one or more bacterial strains belonging to the genus Roseburia. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the genus Roseburia. In some embodiments, the combination comprises one or more bacterial strains belonging to the genus Dorea. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the genus Dorea. In some embodiments, the combination comprises one or more bacterial strains belonging to the genus Bacteroides. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the genus Bacteroides. In some embodiments, the combination comprises one or more bacterial strains belonging to the genus Agathobaculum. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the genus Agathobaculum. In some embodiments, the combination comprises one or more bacterial strains belonging to the genus Lawsonibacter. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the genus Lawsonibacter. In some embodiments, the combination comprises one or more bacterial strains belonging to the genus Tyzzerella. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the genus Tyzzerella. In some embodiments, the combination comprises one or more bacterial strains belonging to the genus Enorma. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the genus Enorma. In some embodiments, the combination comprises one or more bacterial strains belonging to the genus Faecalimonas. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the genus Faecalimonas. In some embodiments, the combination comprises one or more bacterial strains belonging to the genus Thomasclavelia. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the genus Thomasclavelia. In some embodiments, the combination comprises one or more bacterial strains belonging to the genus Clostridium. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the genus Clostridium. In some embodiments, the combination comprises one or more bacterial strains belonging to the genus Fournierella. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the genus Fournierella. In some embodiments, the combination comprises one or more bacterial strains belonging to the genus Massilimicrobiota. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the genus Massilimicrobiota. In some embodiments, the combination comprises one or more bacterial strains belonging to species selected from the group consisting of Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. In some embodiments, the combination comprises 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, or 36 of species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques. These species, listed in Table 3, were detected in subjects receiving FMT from a donor whose microbiota were associated with alleviation of inflammatory bowel disease (IBD) symptoms. The number of subjects in which these species were detected, their abundance, and representative 16S rDNA sequences are also provided in Table 3. Some aspects of the disclosure relate to combinations comprising at least 2 of: (1) an isolated bacterial strain belonging to the species Bacteroides caccae; (2) an isolated bacterial strain belonging to the species Bacteroides intestinalis; (3) an isolated bacterial strain belonging to the species Bacteroides faecis; (4) an isolated bacterial strain belonging to the species Bacteroides ovatus; (5) an isolated bacterial strain belonging to the species Bacteroides thetaiotaomicron; (6) an isolated bacterial strain belonging to the species Bacteroides uniformis; (7) an isolated bacterial strain belonging to the species Bacteroides vulgatus; (8) an isolated bacterial strain belonging to the species Bifidobacterium adolescentis; (9) an isolated bacterial strain belonging to the species Bifidobacterium longum; (10) an isolated bacterial strain belonging to the species Bifidobacterium pseudocatenulatum; (11) an isolated bacterial strain belonging to the species Blautia producta; (12) an isolated bacterial strain belonging to the species Clostridium citroniae; (13) an isolated bacterial strain belonging to the species Clostridium clostridioforme; (14) a first isolated bacterial strain belonging to the species Clostridium innocuum; (15) a second isolated bacterial strain belonging to the species Clostridium innocuum; (16) an isolated bacterial strain belonging to the species Paeniclostridium sordellii; (17) an isolated bacterial strain belonging to the species Coprococcus comes; (18) an isolated bacterial strain belonging to the species Dorea longicatena; (19) an isolated bacterial strain belonging to the species Erysipelatoclostridium ramosum; (20) an isolated bacterial strain belonging to the species Eubacterium rectale; (21) an isolated bacterial strain belonging to the species Odoribacter sp.; (22) an isolated bacterial strain belonging to the species Parabacteroides distasonis; (23) an isolated bacterial strain belonging to the species Parabacteroides merdae; (24) an isolated bacterial strain belonging to the species Bacteroides xylanisolvens; (25) an isolated bacterial strain belonging to the species Blautia obeum; (26) an isolated bacterial strain belonging to the species Alistipes putredinis; (27) an isolated bacterial strain belonging to the species Collinsella aerofaciens; (28) an isolated bacterial strain belonging to the species Eubacterium hallii; (29) an isolated bacterial strain belonging to the species Alistipes shahii; (30) an isolated bacterial strain belonging to the species Anaerostipes caccae; (31) an isolated bacterial strain belonging to the species Phascolarctobacterium faecium; (32) an isolated bacterial strain belonging to the species Agathobaculum butyriciproducens; (33) an isolated bacterial strain belonging to the species Bacteroides fragilis; (34) an isolated bacterial strain belonging to the species Fusobacterium mortiferum; (35) an isolated bacterial strain belonging to the species Paraclostridium bifermentans; and (36) an isolated bacterial strain belonging to the species Escherichia coli. Some aspects of the disclosure relate to combinations comprising at least 2 of: (1) an isolated bacterial strain belonging to the species cluster Agathobaculum hominis; (2) an isolated bacterial strain belonging to the species cluster Alistipes putredinis; (3) an isolated bacterial strain belonging to the species cluster Alistipes shahii; (4) an isolated bacterial strain belonging to the species cluster Anaerostipes caccae; (5) an isolated bacterial strain belonging to the species cluster Bacteroides caccae; (6) an isolated bacterial strain belonging to the species cluster Bacteroides cellulosilyticus; (7) an isolated bacterial strain belonging to the species cluster Bacteroides fragilis; (8) an isolated bacterial strain belonging to the species cluster Bacteroides ovatus; (9) a first isolated bacterial strain belonging to the species cluster Bacteroides thetaiotaomicron; (10) a second isolated bacterial strain belonging to the species cluster Bacteroides thetaiotaomicron; (11) an isolated bacterial strain belonging to the species cluster Bacteroides uniformis; (12) an isolated bacterial strain belonging to the species cluster Bacteroides xylanisolvens; (13) an isolated bacterial strain belonging to the species cluster Bacillus paralicheniformis; (14) an isolated bacterial strain belonging to the species cluster Bifidobacterium longum; (15) an isolated bacterial strain belonging to the species cluster Bifidobacterium pseudocatenulatum; (16) an isolated bacterial strain belonging to the species cluster Blautia coccoides; (17) an isolated bacterial strain belonging to the species cluster Blautia_A obeum; (18) an isolated bacterial strain belonging to the species cluster Enterocloster citroniae; (19) an isolated bacterial strain belonging to the species cluster Enterocloster clostridioformis; (20) a first isolated bacterial strain belonging to the species cluster Clostridium_AQ innocuum; (21) a second isolated bacterial strain belonging to the species cluster Clostridium_AQ innocuum; (22) an isolated bacterial strain belonging to the species cluster Collinsella sp019041915; (23) an isolated bacterial strain belonging to the species cluster Bariatricus comes; (24) an isolated bacterial strain belonging to the species cluster Dorea_A amylophila; (25) an isolated bacterial strain belonging to the species cluster Thomasclavelia ramosa; (26) an isolated bacterial strain belonging to the species cluster Escherichia coli; (27) an isolated bacterial strain belonging to the species cluster Anaerobutyricum hallii; (28) an isolated bacterial strain belonging to the species cluster Agathobacter rectalis; (29) an isolated bacterial strain belonging to the species cluster Fusobacterium_A sp900555485; (30) an isolated bacterial strain belonging to the species cluster Odoribacter splanchnicus; (31) an isolated bacterial strain belonging to the species cluster Paraclostridium sordellii; (32) an isolated bacterial strain belonging to the species cluster Parabacteroides distasonis; (33) an isolated bacterial strain belonging to the species cluster Parabacteroides merdae; (34) an isolated bacterial strain belonging to the species cluster Paraclostridium dentum; (35) an isolated bacterial strain belonging to the species cluster Phascolarctobacterium faecium; and (36) an isolated bacterial strain belonging to the species cluster Phocaeicola vulgatus. In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 3 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 4 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 5 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 6 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 7 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 8 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 9 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 10 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 11 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 12 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 13 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 14 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 15 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 16 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 17 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 18 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 19 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 20 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 21 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 22 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 23 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 24 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 25 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 26 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 27 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 28 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 29 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 30 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 31 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 32 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 33 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 34 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 35 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises each of the bacterial strains of (1)-(36). In some embodiments, substantially all bacteria in the combination are bacterial strains of (1)-(36). In some embodiments, the combination does not comprise bacterial strains other than one or more bacterial strains of (1)-(36) above a limit of detection. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Atopobium minutum. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Atopobium minutum. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Bacillus paralicheniformis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Bacillus paralicheniformis. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Bacteroides caccae. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Bacteroides caccae. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Bacteroides cellulosilyticus. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Bacteroides cellulosilyticus. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Bacteroides dorei. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Bacteroides dorei. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Bacteroides fragilis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Bacteroides fragilis. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Bacteroides ovatus. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Bacteroides ovatus. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Bacteroides thetaiotaomicron. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Bacteroides thetaiotaomicron. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Bacteroides uniformis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Bacteroides uniformis. In some embodiments, the combination comprises two different bacterial strains belonging to the species Bacteroides uniformis. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Bacteroides vulgatus. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Bacteroides vulgatus. In some embodiments, the combination comprises 2 or 3 different bacterial strains belonging to the species Bacteroides vulgatus. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Bacteroides xylanisolvens. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Bacteroides xylanisolvens. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Barnesiella intestinihominis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Barnesiella intestinihominis. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Bifidobacterium adolescentis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Bifidobacterium adolescentis. In some embodiments, the combination comprises 2 different bacterial strains belonging to the species Bifidobacterium adolescentis. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Bifidobacterium longum. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Bifidobacterium longum. In some embodiments, the combination comprises 2 different bacterial strains belonging to the species Bifidobacterium longum. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Bifidobacterium pseudocatenulatum. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Bifidobacterium pseudocatenulatum. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Bilophila wadsworthia. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Bilophila wadsworthia. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Blautia wexlerae. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Blautia wexlerae. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Butyricicoccus sp.. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Butyricicoccus sp.. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Butyricimonas faecihominis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Butyricimonas faecihominis. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Clostridium citroniae. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Clostridium citroniae. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Clostridium innocuum. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Clostridium innocuum. In some embodiments, the combination comprises 2 or 3 different bacterial strains belonging to the species Clostridium innocuum. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Collinsella sp. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Collinsella sp. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Coprococcus comes. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Coprococcus comes. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Eggerthella lenta. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Eggerthella lenta. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Escherichia coli. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Escherichia coli. In some embodiments, the combination comprises 2, 3, or 4 different bacterial strains belonging to the species Escherichia coli. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Eubacterium callanderi. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Eubacterium callanderi. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Faecalibacterium prausnitzii. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Faecalibacterium prausnitzii. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Faecalicatena orotica. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Faecalicatena orotica. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Hungatella hathewayi. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Hungatella hathewayi. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Odoribacter splanchnicus. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Odoribacter splanchnicus. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Parabacteroides distasonis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Parabacteroides distasonis. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Parabacteroides merdae. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Parabacteroides merdae. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Paraclostridium bifermentans. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Paraclostridium bifermentans. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Peptoniphilus harei. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Peptoniphilus harei. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Ruminococcus sp. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Ruminococcus sp. In some embodiments, the combination comprises one or more bacterial strains belonging to the species Ruminococcus torques. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species Ruminococcus torques. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Agathobaculum hominis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Agathobaculum hominis. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Alistipes putredinis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Alistipes putredinis. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Alistipes shahii. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Alistipes shahii. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Anaerostipes caccae. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Anaerostipes caccae. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Bacteroides caccae. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Bacteroides caccae. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Bacteroides cellulosilyticus. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Bacteroides cellulosilyticus. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Bacteroides fragilis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Bacteroides fragilis. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Bacteroides ovatus. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Bacteroides ovatus. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Bacteroides thetaiotaomicron. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Bacteroides thetaiotaomicron. In some embodiments, the combination comprises two or more bacterial strains belonging to the species cluster Bacteroides thetaiotaomicron. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Bacteroides uniformis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Bacteroides uniformis. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Bacteroides xylanisolvens. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Bacteroides xylanisolvens. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Bacillus paralicheniformis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Bacillus paralicheniformis. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Bifidobacterium longum. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Bifidobacterium longum. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Bifidobacterium pseudocatenulatum. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Bifidobacterium pseudocatenulatum. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Blautia coccoides. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Blautia coccoides. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Blautia_A obeum. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Blautia_A obeum. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Enterocloster citroniae. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Enterocloster citroniae. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Enterocloster clostridioformis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Enterocloster clostridioformis. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Clostridium_AQ innocuum. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Clostridium_AQ innocuum. In some embodiments, the combination comprises two or more bacterial strains belonging to the species cluster Clostridium_AQ innocuum. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Collinsella sp019041915. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Collinsella sp019041915. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Bariatricus comes. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Bariatricus comes. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Dorea_A amylophila. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Dorea_A amylophila. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Thomasclavelia ramosa. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Thomasclavelia ramosa. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Escherichia coli. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Escherichia coli. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Anaerobutyricum hallii. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Anaerobutyricum hallii. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Agathobacter rectalis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Agathobacter rectalis. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Fusobacterium_A sp900555485. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Fusobacterium_A sp900555485. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Odoribacter splanchnicus. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Odoribacter splanchnicus. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Paraclostridium sordellii. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Paraclostridium sordellii. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Parabacteroides distasonis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Parabacteroides distasonis. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Parabacteroides merdae. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Parabacteroides merdae. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Paraclostridium dentum. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Paraclostridium dentum. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Phascolarctobacterium faecium. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Phascolarctobacterium faecium. In some embodiments, the combination comprises one or more bacterial strains belonging to the species cluster Phocaeicola vulgatus. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains belonging to the species cluster Phocaeicola vulgatus. Multiple bacterial strains belonging to the same genus may belong to the same species. Alternatively, multiple bacterial strains belonging to the same genus may belong to different species. Multiple bacterial strains belonging to the same species or species cluster may differ in one or more characteristics. Bacterial strains belonging to the same species or species cluster may be distinguished using one or more of multiple features known in the art, such as colony morphology (e.g., smooth v. rough, flat v. raised, color). Bacterial strains of the same species or species cluster may also be distinguished on the basis of presence or absence of one or more genes, such as antibiotic resistance genes. Bacterial strains within a species or species cluster may also be distinguished by variation between 16S rDNA sequences. In some embodiments, the combination of bacterial strains lacks one or more bacterial strains of a particular genus or species. In some embodiments, the composition does not comprise one or more bacterial strains of a particular genus or species. In some embodiments, the kit does not comprise one or more bacterial strains of a particular genus or species. In some embodiments, the method does not comprise administering a bacterial strain of a particular genus or species to a subject. Compositions may be said not to comprise (i.e., to lack) bacterial strains of a given genus or species if bacteria of that genus or species, respectively, are not detectable in the composition above a limit of detection. Kits may be said not to comprise (i.e., to lack) bacterial strains of a given or species if bacteria of that genus or species, respectively, are not detectable in any dosage form of the kit. A method may be said not to comprise administering (i.e., to lack administering) bacterial strains of a given genus or species if no dosage form administered to a subject comprises a detectable amount of bacterial strains of that genus or species. In each case, it is the combination of bacterial strains contemplated in a composition, kit, or method, that the skilled artisan will evaluate in determining whether a bacterial strain is present or used. In some embodiments of a method that does not comprise administrating a specified bacterial strain, the specified bacterial strain is not administered to the subject within 1 day, within 1 week, or within 1 month of administering any other bacterial strain of the method. Methods of detecting bacterial strains of a given species are known in the art, including amplification, sequencing, and identification of 16S rDNA isolated from a biological sample (e.g., composition). In some embodiments, the combination does not comprise a bacterial strain belonging to the genus Dialister. In some embodiments, at least one genus of bacteria selected from Prevotella, Slackia, Paraprevotella, Asaccharobacteria, and Desulfovibrio is not present in the combination. In some embodiments, at least two genera selected from Prevotella, Slackia, Paraprevotella, Asaccharobacteria, and Desulfovibrio are not present in the combination. In some embodiments, at least three genera selected from Prevotella, Slackia, Paraprevotella, Asaccharobacteria, and Desulfovibrio are not present in the combination. In some embodiments, at least four genera selected from Prevotella, Slackia, Paraprevotella, Asaccharobacteria, and Desulfovibrio are not present in the combination. In some embodiments, no bacterial strains belonging to the genus Prevotella, no bacterial strains belonging to the genus Slackia, no bacterial strains belonging to the genus Paraprevotella, no bacterial strains belonging to the genus Asaccharobacteria, and no bacterial strains belonging to the genus Desulfovibrio, are present in the combination. Combinations may include one or more additional bacterial strains. Additional bacterial strains may be taxonomically or phylogenetically related to bacterial strains of Bacteroides caccae, Bacteroides intestinalis, Bacteroides faecis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides vulgatus, Bifidobacterium adolescentis, Bifidobacterium longum, Bifidobacterium pseudocatenulatum, Blautia producta, Clostridium citroniae, Clostridium clostridioforme, Clostridium innocuum, Paeniclostridium sordellii, Coprococcus comes, Dorea longicatena, Erysipelatoclostridium ramosum, Eubacterium rectale, Odoribacter sp., Parabacteroides distasonis, Parabacteroides merdae, Bacteroides xylanisolvens, Blautia obeum, Alistipes putredinis, Collinsella aerofaciens, Eubacterium hallii, Alistipes shahii, Anaerostipes caccae, Phascolarctobacterium faecium, Agathobaculum butyriciproducens, Bacteroides fragilis, Fusobacterium mortiferum, Paraclostridium bifermentans, and / or Escherichia coli. For example, in some embodiments, one or more of the additional bacterial strains belongs to the same phylum, class, order, family genus, or species as another strain described herein. In some embodiments, one or more additional bacterial strains belong to species Bacteroides caccae, Bacteroides intestinalis, Bacteroides faecis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides vulgatus, Bifidobacterium adolescentis, Bifidobacterium longum, Bifidobacterium pseudocatenulatum, Blautia producta, Clostridium citroniae, Clostridium clostridioforme, Clostridium innocuum, Paeniclostridium sordellii, Coprococcus comes, Dorea longicatena, Erysipelatoclostridium ramosum, Eubacterium rectale, Odoribacter sp., Parabacteroides distasonis, Parabacteroides merdae, Bacteroides xylanisolvens, Blautia obeum, Alistipes putredinis, Collinsella aerofaciens, Eubacterium hallii, Alistipes shahii, Anaerostipes caccae, Phascolarctobacterium faecium, Agathobaculum butyriciproducens, Bacteroides fragilis, Fusobacterium mortiferum, Paraclostridium bifermentans, and Escherichia coli. In some embodiments, one or more of the additional bacterial strains belong to the species Bacteroides caccae. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Bacteroides caccae. In some embodiments, one or more of the additional bacterial strains belong to the species Bacteroides intestinalis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Bacteroides intestinalis. In some embodiments, one or more of the additional bacterial strains belong to the species Bacteroides faecis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Bacteroides faecis. In some embodiments, one or more of the additional bacterial strains belong to the species Bacteroides ovatus. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Bacteroides ovatus. In some embodiments, one or more of the additional bacterial strains belong to the species Bacteroides thetaiotaomicron. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Bacteroides thetaiotaomicron. In some embodiments, one or more of the additional bacterial strains belong to the species Bacteroides uniformis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Bacteroides uniformis. In some embodiments, one or more of the additional bacterial strains belong to the species Bacteroides vulgatus. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Bacteroides vulgatus. In some embodiments, one or more of the additional bacterial strains belong to the species Bifidobacterium adolescentis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Bifidobacterium adolescentis. In some embodiments, one or more of the additional bacterial strains belong to the species Bifidobacterium longum. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Bifidobacterium longum. In some embodiments, one or more of the additional bacterial strains belong to the species Bifidobacterium pseudocatenulatum. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Bifidobacterium pseudocatenulatum. In some embodiments, one or more of the additional bacterial strains belong to the species Blautia producta. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Blautia producta. In some embodiments, one or more of the additional bacterial strains belong to the species Clostridium citroniae. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Clostridium citroniae. In some embodiments, one or more of the additional bacterial strains belong to the species Clostridium clostridioforme. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Clostridium clostridioforme. In some embodiments, one or more of the additional bacterial strains belong to the species Clostridium innocuum. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Clostridium innocuum. In some embodiments, two or more of the additional bacterial strains belong to the species Clostridium innocuum, where at least two strains belonging to Clostridium innocuum are different bacterial strains. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Clostridium innocuum. In some embodiments, one or more of the additional bacterial strains belong to the species Paeniclostridium sordellii. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Paeniclostridium sordellii. In some embodiments, one or more of the additional bacterial strains belong to the species Coprococcus comes. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Coprococcus comes. In some embodiments, one or more of the additional bacterial strains belong to the species Dorea longicatena. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Dorea longicatena. In some embodiments, one or more of the additional bacterial strains belong to the species Erysipelatoclostridium ramosum. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Erysipelatoclostridium ramosum. In some embodiments, one or more of the additional bacterial strains belong to the species Eubacterium rectale. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Eubacterium rectale. In some embodiments, one or more of the additional bacterial strains belong to the species Odoribacter sp. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Odoribacter sp. In some embodiments, one or more of the additional bacterial strains belong to the species Parabacteroides distasonis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Parabacteroides distasonis. In some embodiments, one or more of the additional bacterial strains belong to the species Parabacteroides merdae. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Parabacteroides merdae. In some embodiments, one or more of the additional bacterial strains belong to the species Bacteroides xylanisolvens. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Bacteroides xylanisolvens. In some embodiments, one or more of the additional bacterial strains belong to the species Blautia obeum. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Blautia obeum. In some embodiments, one or more of the additional bacterial strains belong to the species Alistipes putredinis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Alistipes putredinis. In some embodiments, one or more of the additional bacterial strains belong to the species Collinsella aerofaciens. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Collinsella aerofaciens. In some embodiments, one or more of the additional bacterial strains belong to the species Eubacterium hallii. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Eubacterium hallii. In some embodiments, one or more of the additional bacterial strains belong to the species Alistipes shahii. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Alistipes shahii. In some embodiments, one or more of the additional bacterial strains belong to the species Anaerostipes caccae. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Anaerostipes caccae. In some embodiments, one or more of the additional bacterial strains belong to the species Phascolarctobacterium faecium. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Phascolarctobacterium faecium. In some embodiments, one or more of the additional bacterial strains belong to the species Agathobaculum butyriciproducens. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Agathobaculum butyriciproducens. In some embodiments, one or more of the additional bacterial strains belong to the species Bacteroides fragilis. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Bacteroides fragilis. In some embodiments, one or more of the additional bacterial strains belong to the species Fusobacterium mortiferum. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Fusobacterium mortiferum. In some embodiments, one or more of the additional bacterial strains belong to the species Paraclostridium bifermentans. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Paraclostridium bifermentans. In some embodiments, one or more of the additional bacterial strains belong to the species Escherichia coli. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains belonging to the species Escherichia coli. In some embodiments, the combinations disclosed herein comprise two or more bacterial strains. In some embodiments, the combinations described herein comprise at least 2, at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, at least 14, at least 15, at least 16, at least 17, at least 18, at least 19, at least 20, at least 21, at least 22, at least 23, at least 24, at least 25, at least 26, at least 27, at least 28, at least 29, at least 30, at least 31, at least 32, at least 33, at least 34, at least 35, at least 36, at least 37, at least 38, at least 39, at least 40, at least 41, at least 42, at least 43, at least 44, at least 45, at least 46, at least 47, at least 48, at least 49, at least 50, at least 51, at least 52, at least 53, at least 54, at least 55, at least 56, at least 57, at least 58, at least 59, or up to 60 total bacterial strains (e.g., isolated bacterial strains). In some embodiments, the combinations described herein comprise 1-60, 2-60, 3-60, 4-60, 5-60, 6-60, 7-60, 8-60, 9- 60, 10-60, 11-60, 12-60, 13-60, 14-60, 15-60, 16-60, 17-60, 18-60, 19-60, 20-60, 21-60, 22- 60, 23-60, 24-60, 25-60, 26-60, 27-60, 28-60, 29-60, 30-60, 31-60, 32-60, 33-60, 34-60, 35- 60, 36-60, 37-60, 38-60, 39-60, 40-60, 41-60, 42-60, 43-60, 44-60, 45-60, 46-60, 47-60, 48- 60, 49-60, 50-60, 51-60, 52-60, 53-60, 54-60, 55-60, 56-60, 57-60, 58-60, 59-60, 1-59, 2-59, 3-59, 4-59, 5-59, 6-59, 7-59, 8-59, 9-59, 10-59, 11-59, 12-59, 13-59, 14-59, 15-59, 16-59, 17- 59, 18-59, 19-59, 20-59, 21-59, 22-59, 23-59, 24-59, 25-59, 26-59, 27-59, 28-59, 29-59, 30- 59, 31-59, 32-59, 33-59, 34-59, 35-59, 36-59, 37-59, 38-59, 39-59, 40-59, 41-59, 42-59, 43- 59, 44-59, 45-59, 46-59, 47-59, 48-59, 49-59, 50-59, 51-59, 52-59, 53-59, 54-59, 55-59, 56- 59, 57-59, 58-59, 1-58, 2-58, 3-58, 4-58, 5-58, 6-58, 7-58, 8-58, 9-58, 10-58, 11-58, 12-58, 13-58, 14-58, 15-58, 16-58, 17-58, 18-58, 19-58, 20-58, 21-58, 22-58, 23-58, 24-58, 25-58, 26-58, 27-58, 28-58, 29-58, 30-58, 31-58, 32-58, 33-58, 34-58, 35-58, 36-58, 37-58, 38-58, 39-58, 40-58, 41-58, 42-58, 43-58, 44-58, 45-58, 46-58, 47-58, 48-58, 49-58, 50-58, 51-58, 52-58, 53-58, 54-58, 55-58, 56-58, 57-58, 1-57, 2-57, 3-57, 4-57, 5-57, 6-57, 7-57, 8-57, 9- 57, 10-57, 11-57, 12-57, 13-57, 14-57, 15-57, 16-57, 17-57, 18-57, 19-57, 20-57, 21-57, 22- 57, 23-57, 24-57, 25-57, 26-57, 27-57, 28-57, 29-57, 30-57, 31-57, 32-57, 33-57, 34-57, 35- 57, 36-57, 37-57, 38-57, 39-57, 40-57, 41-57, 42-57, 43-57, 44-57, 45-57, 46-57, 47-57, 48- 57, 49-57, 50-57, 51-57, 52-57, 53-57, 54-57, 55-57, 56-57, 1-56, 2-56, 3-56, 4-56, 5-56, 6- 56, 7-56, 8-56, 9-56, 10-56, 11-56, 12-56, 13-56, 14-56, 15-56, 16-56, 17-56, 18-56, 19-56, 20-56, 21-56, 22-56, 23-56, 24-56, 25-56, 26-56, 27-56, 28-56, 29-56, 30-56, 31-56, 32-56, 33-56, 34-56, 35-56, 36-56, 37-56, 38-56, 39-56, 40-56, 41-56, 42-56, 43-56, 44-56, 45-56, 46-56, 47-56, 48-56, 49-56, 50-56, 51-56, 52-56, 53-56, 54-56, 55-56, 1-55, 2-55, 3-55, 4-55, 5-55, 6-55, 7-55, 8-55, 9-55, 10-55, 11-55, 12-55, 13-55, 14-55, 15-55, 16-55, 17-55, 18-55, 19-55, 20-55, 21-55, 22-55, 23-55, 24-55, 25-55, 26-55, 27-55, 28-55, 29-55, 30-55, 31-55, 32-55, 33-55, 34-55, 35-55, 36-55, 37-55, 38-55, 39-55, 40-55, 41-55, 42-55, 43-55, 44-55, 45-55, 46-55, 47-55, 48-55, 49-55, 50-55, 51-55, 52-55, 53-55, 54-55, 1-54, 2-54, 3-54, 4-54, 5-54, 6-54, 7-54, 8-54, 9-54, 10-54, 11-54, 12-54, 13-54, 14-54, 15-54, 16-54, 17-54, 18-54, 19-54, 20-54, 21-54, 22-54, 23-54, 24-54, 25-54, 26-54, 27-54, 28-54, 29-54, 30-54, 31-54, 32-54, 33-54, 34-54, 35-54, 36-54, 37-54, 38-54, 39-54, 40-54, 41-54, 42-54, 43-54, 44-54, 45-54, 46-54, 47-54, 48-54, 49-54, 50-54, 51-54, 52-54, 53-54, 1-53, 2-53, 3-53, 4-53, 5-53, 6-53, 7-53, 8-53, 9-53, 10-53, 11-53, 12-53, 13-53, 14-53, 15-53, 16-53, 17-53, 18-53, 19-53, 20-53, 21-53, 22-53, 23-53, 24-53, 25-53, 26-53, 27-53, 28-53, 29-53, 30-53, 31-53, 32-53, 33-53, 34-53, 35-53, 36-53, 37-53, 38-53, 39-53, 40-53, 41-53, 42-53, 43-53, 44-53, 45-53, 46-53, 47-53, 48-53, 49-53, 50-53, 51-53, 52-53, 1-52, 2-52, 3-52, 4-52, 5-52, 6-52, 7-52, 8- 52, 9-52, 10-52, 11-52, 12-52, 13-52, 14-52, 15-52, 16-52, 17-52, 18-52, 19-52, 20-52, 21-52, 22-52, 23-52, 24-52, 25-52, 26-52, 27-52, 28-52, 29-52, 30-52, 31-52, 32-52, 33-52, 34-52, 35-52, 36-52, 37-52, 38-52, 39-52, 40-52, 41-52, 42-52, 43-52, 44-52, 45-52, 46-52, 47-52, 48-52, 49-52, 50-52, 51-52, 1-51, 2-51, 3-51, 4-51, 5-51, 6-51, 7-51, 8-51, 9-51, 10-51, 11- 51, 12-51, 13-51, 14-51, 15-51, 16-51, 17-51, 18-51, 19-51, 20-51, 21-51, 22-51, 23-51, 24- 51, 25-51, 26-51, 27-51, 28-51, 29-51, 30-51, 31-51, 32-51, 33-51, 34-51, 35-51, 36-51, 37- 51, 38-51, 39-51, 40-51, 41-51, 42-51, 43-51, 44-51, 45-51, 46-51, 47-51, 48-51, 49-51, 50- 51, 1-50, 2-50, 3-50, 4-50, 5-50, 6-50, 7-50, 8-50, 9-50, 10-50, 11-50, 12-50, 13-50, 14-50, 15-50, 16-50, 17-50, 18-50, 19-50, 20-50, 21-50, 22-50, 23-50, 24-50, 25-50, 26-50, 27-50, 28-50, 29-50, 30-50, 31-50, 32-50, 33-50, 34-50, 35-50, 36-50, 37-50, 38-50, 39-50, 40-50, 41-50, 42-50, 43-50, 44-50, 45-50, 46-50, 47-50, 48-50, 49-50, 1-49, 2-49, 3-49, 4-49, 5-49, 6-49, 7-49, 8-49, 9-49, 10-49, 11-49, 12-49, 13-49, 14-49, 15-49, 16-49, 17-49, 18-49, 19-49, 20-49, 21-49, 22-49, 23-49, 24-49, 25-49, 26-49, 27-49, 28-49, 29-49, 30-49, 31-49, 32-49, 33-49, 34-49, 35-49, 36-49, 37-49, 38-49, 39-49, 40-49, 41-49, 42-49, 43-49, 44-49, 45-49, 46-49, 47-49, 48-49, 1-48, 2-48, 3-48, 4-48, 5-48, 6-48, 7-48, 8-48, 9-48, 10-48, 11-48, 12- 48, 13-48, 14-48, 15-48, 16-48, 17-48, 18-48, 19-48, 20-48, 21-48, 22-48, 23-48, 24-48, 25- 48, 26-48, 27-48, 28-48, 29-48, 30-48, 31-48, 32-48, 33-48, 34-48, 35-48, 36-48, 37-48, 38- 48, 39-48, 40-48, 41-48, 42-48, 43-48, 44-48, 45-48, 46-48, 47-48, 1-47, 2-47, 3-47, 4-47, 5- 47, 6-47, 7-47, 8-47, 9-47, 10-47, 11-47, 12-47, 13-47, 14-47, 15-47, 16-47, 17-47, 18-47, 19-47, 20-47, 21-47, 22-47, 23-47, 24-47, 25-47, 26-47, 27-47, 28-47, 29-47, 30-47, 31-47, 32-47, 33-47, 34-47, 35-47, 36-47, 37-47, 38-47, 39-47, 40-47, 41-47, 42-47, 43-47, 44-47, 45-47, 46-47, 1-46, 2-46, 3-46, 4-46, 5-46, 6-46, 7-46, 8-46, 9-46, 10-46, 11-46, 12-46, 13- 46, 14-46, 15-46, 16-46, 17-46, 18-46, 19-46, 20-46, 21-46, 22-46, 23-46, 24-46, 25-46, 26- 46, 27-46, 28-46, 29-46, 30-46, 31-46, 32-46, 33-46, 34-46, 35-46, 36-46, 37-46, 38-46, 39- 46, 40-46, 41-46, 42-46, 43-46, 44-46, 45-46, 1-45, 2-45, 3-45, 4-45, 5-45, 6-45, 7-45, 8-45, 9-45, 10-45, 11-45, 12-45, 13-45, 14-45, 15-45, 16-45, 17-45, 18-45, 19-45, 20-45, 21-45, 22-45, 23-45, 24-45, 25-45, 26-45, 27-45, 28-45, 29-45, 30-45, 31-45, 32-45, 33-45, 34-45, 35-45, 36-45, 37-45, 38-45, 39-45, 40-45, 41-45, 42-45, 43-45, 44-45, 1-44, 2-44, 3-44, 4-44, 5-44, 6-44, 7-44, 8-44, 9-44, 10-44, 11-44, 12-44, 13-44, 14-44, 15-44, 16-44, 17-44, 18-44, 19-44, 20-44, 21-44, 22-44, 23-44, 24-44, 25-44, 26-44, 27-44, 28-44, 29-44, 30-44, 31-44, 32-44, 33-44, 34-44, 35-44, 36-44, 37-44, 38-44, 39-44, 40-44, 41-44, 42-44, 43-44, 1-43, 2- 43, 3-43, 4-43, 5-43, 6-43, 7-43, 8-43, 9-43, 10-43, 11-43, 12-43, 13-43, 14-43, 15-43, 16-43, 17-43, 18-43, 19-43, 20-43, 21-43, 22-43, 23-43, 24-43, 25-43, 26-43, 27-43, 28-43, 29-43, 30-43, 31-43, 32-43, 33-43, 34-43, 35-43, 36-43, 37-43, 38-43, 39-43, 40-43, 41-43, 42-43, 1-42, 2-42, 3-42, 4-42, 5-42, 6-42, 7-42, 8-42, 9-42, 10-42, 11-42, 12-42, 13-42, 14-42, 15- 42, 16-42, 17-42, 18-42, 19-42, 20-42, 21-42, 22-42, 23-42, 24-42, 25-42, 26-42, 27-42, 28- 42, 29-42, 30-42, 31-42, 32-42, 33-42, 34-42, 35-42, 36-42, 37-42, 38-42, 39-42, 40-42, 41- 42, 1-41, 2-41, 3-41, 4-41, 5-41, 6-41, 7-41, 8-41, 9-41, 10-41, 11-41, 12-41, 13-41, 14-41, 15-41, 16-41, 17-41, 18-41, 19-41, 20-41, 21-41, 22-41, 23-41, 24-41, 25-41, 26-41, 27-41, 28-41, 29-41, 30-41, 31-41, 32-41, 33-41, 34-41, 35-41, 36-41, 37-41, 38-41, 39-41, 40-41, 1-40, 2-40, 3-40, 4-40, 5-40, 6-40, 7-40, 8-40, 9-40, 10-40, 11-40, 12-40, 13-40, 14-40, 15- 40, 16-40, 17-40, 18-40, 19-40, 20-40, 21-40, 22-40, 23-40, 24-40, 25-40, 26-40, 27-40, 28- 40, 29-40, 30-40, 31-40, 32-40, 33-40, 34-40, 35-40, 36-40, 37-40, 38-40, 39-40, 1-39, 2-39, 3-39, 4-39, 5-39, 6-39, 7-39, 8-39, 9-39, 10-39, 11-39, 12-39, 13-39, 14-39, 15-39, 16-39, 17- 39, 18-39, 19-39, 20-39, 21-39, 22-39, 23-39, 24-39, 25-39, 26-39, 27-39, 28-39, 29-39, 30- 39, 31-39, 32-39, 33-39, 34-39, 35-39, 36-39, 37-39, 38-39, 1-38, 2-38, 3-38, 4-38, 5-38, 6- 38, 7-38, 8-38, 9-38, 10-38, 11-38, 12-38, 13-38, 14-38, 15-38, 16-38, 17-38, 18-38, 19-38, 20-38, 21-38, 22-38, 23-38, 24-38, 25-38, 26-38, 27-38, 28-38, 29-38, 30-38, 31-38, 32-38, 33-38, 34-38, 35-38, 36-38, 37-38, 1-37, 2-37, 3-37, 4-37, 5-37, 6-37, 7-37, 8-37, 9-37, 10- 37, 11-37, 12-37, 13-37, 14-37, 15-37, 16-37, 17-37, 18-37, 19-37, 20-37, 21-37, 22-37, 23- 37, 24-37, 25-37, 26-37, 27-37, 28-37, 29-37, 30-37, 31-37, 32-37, 33-37, 34-37, 35-37, 36- 37, 1-36, 2-36, 3-36, 4-36, 5-36, 6-36, 7-36, 8-36, 9-36, 10-36, 11-36, 12-36, 13-36, 14-36, 15-36, 16-36, 17-36, 18-36, 19-36, 20-36, 21-36, 22-36, 23-36, 24-36, 25-36, 26-36, 27-36, 28-36, 29-36, 30-36, 31-36, 32-36, 33-36, 34-36, 35-36, 1-35, 2-35, 3-35, 4-35, 5-35, 6-35, 7- 35, 8-35, 9-35, 10-35, 11-35, 12-35, 13-35, 14-35, 15-35, 16-35, 17-35, 18-35, 19-35, 20-35, 21-35, 22-35, 23-35, 24-35, 25-35, 26-35, 27-35, 28-35, 29-35, 30-35, 31-35, 32-35, 33-35, 34-35, 1-34, 2-34, 3-34, 4-34, 5-34, 6-34, 7-34, 8-34, 9-34, 10-34, 11-34, 12-34, 13-34, 14- 34, 15-34, 16-34, 17-34, 18-34, 19-34, 20-34, 21-34, 22-34, 23-34, 24-34, 25-34, 26-34, 27- 34, 28-34, 29-34, 30-34, 31-34, 32-34, 33-34, 1-33, 2-33, 3-33, 4-33, 5-33, 6-33, 7-33, 8-33, 9-33, 10-33, 11-33, 12-33, 13-33, 14-33, 15-33, 16-33, 17-33, 18-33, 19-33, 20-33, 21-33, 22-33, 23-33, 24-33, 25-33, 26-33, 27-33, 28-33, 29-33, 30-33, 31-33, 32-33, 1-32, 2-32, 3- 32, 4-32, 5-32, 6-32, 7-32, 8-32, 9-32, 10-32, 11-32, 12-32, 13-32, 14-32, 15-32, 16-32, 17- 32, 18-32, 19-32, 20-32, 21-32, 22-32, 23-32, 24-32, 25-32, 26-32, 27-32, 28-32, 29-32, 30- 32, 31-32, 1-31, 2-31, 3-31, 4-31, 5-31, 6-31, 7-31, 8-31, 9-31, 10-31, 11-31, 12-31, 13-31, 14-31, 15-31, 16-31, 17-31, 18-31, 19-31, 20-31, 21-31, 22-31, 23-31, 24-31, 25-31, 26-31, 27-31, 28-31, 29-31, 30-31, 1-30, 2-30, 3-30, 4-30, 5-30, 6-30, 7-30, 8-30, 9-30, 10-30, 11- 30, 12-30, 13-30, 14-30, 15-30, 16-30, 17-30, 18-30, 19-30, 20-30, 21-30, 22-30, 23-30, 24- 30, 25-30, 26-30, 27-30, 28-30, 29-30, 1-29, 2-29, 3-29, 4-29, 5-29, 6-29, 7-29, 8-29, 9-29, 10-29, 11-29, 12-29, 13-29, 14-29, 15-29, 16-29, 17-29, 18-29, 19-29, 20-29, 21-29, 22-29, 23-29, 24-29, 25-29, 26-29, 27-29, 28-29, 1-28, 2-28, 3-28, 4-28, 5-28, 6-28, 7-28, 8-28, 9- 28, 10-28, 11-28, 12-28, 13-28, 14-28, 15-28, 16-28, 17-28, 18-28, 19-28, 20-28, 21-28, 22- 28, 23-28, 24-28, 25-28, 26-28, 27-28, 1-27, 2-27, 3-27, 4-27, 5-27, 6-27, 7-27, 8-27, 9-27, 10-27, 11-27, 12-27, 13-27, 14-27, 15-27, 16-27, 17-27, 18-27, 19-27, 20-27, 21-27, 22-27, 23-27, 24-27, 25-27, 26-27, 1-26, 2-26, 3-26, 4-26, 5-26, 6-26, 7-26, 8-26, 9-26, 10-26, 11- 26, 12-26, 13-26, 14-26, 15-26, 16-26, 17-26, 18-26, 19-26, 20-26, 21-26, 22-26, 23-26, 24- 26, 25-26, 1-25, 2-25, 3-25, 4-25, 5-25, 6-25, 7-25, 8-25, 9-25, 10-25, 11-25, 12-25, 13-25, 14-25, 15-25, 16-25, 17-25, 18-25, 19-25, 20-25, 21-25, 22-25, 23-25, 24-25, 1-24, 2-24, 3- 24, 4-24, 5-24, 6-24, 7-24, 8-24, 9-24, 10-24, 11-24, 12-24, 13-24, 14-24, 15-24, 16-24, 17- 24, 18-24, 19-24, 20-24, 21-24, 22-24, 23-24, 1-23, 2-23, 3-23, 4-23, 5-23, 6-23, 7-23, 8-23, 9-23, 10-23, 11-23, 12-23, 13-23, 14-23, 15-23, 16-23, 17-23, 18-23, 19-23, 20-23, 21-23, 22-23, 1-22, 2-22, 3-22, 4-22, 5-22, 6-22, 7-22, 8-22, 9-22, 10-22, 11-22, 12-22, 13-22, 14- 22, 15-22, 16-22, 17-22, 18-22, 19-22, 20-22, 21-22, 1-21, 2-21, 3-21, 4-21, 5-21, 6-21, 7-21, 8-21, 9-21, 10-21, 11-21, 12-21, 13-21, 14-21, 15-21, 16-21, 17-21, 18-21, 19-21, 20-21, 1- 20, 2-20, 3-20, 4-20, 5-20, 6-20, 7-20, 8-20, 9-20, 10-20, 11-20, 12-20, 13-20, 14-20, 15-20, 16-20, 17-20, 18-20, 19-20, 1-19, 2-19, 3-19, 4-19, 5-19, 6-19, 7-19, 8-19, 9-19, 10-19, 11- 19, 12-19, 13-19, 14-19, 15-19, 16-19, 17-19, 18-19, 1-18, 2-18, 3-18, 4-18, 5-18, 6-18, 7-18, 8-18, 9-18, 10-18, 11-18, 12-18, 13-18, 14-18, 15-18, 16-18, 17-18, 1-17, 2-17, 3-17, 4-17, 5- 17, 6-17, 7-17, 8-17, 9-17, 10-17, 11-17, 12-17, 13-17, 14-17, 15-17, 16-17, 1-16, 2-16, 3-16, 4-16, 5-16, 6-16, 7-16, 8-16, 9-16, 10-16, 11-16, 12-16, 13-16, 14-16, 15-16, 1-15, 2-15, 3- 15, 4-15, 5-15, 6-15, 7-15, 8-15, 9-15, 10-15, 11-15, 12-15, 13-15, 14-15, 1-14, 2-14, 3-14, 4- 14, 5-14, 6-14, 7-14, 8-14, 9-14, 10-14, 11-14, 12-14, 13-14, 1-13, 2-13, 3-13, 4-13, 5-13, 6- 13, 7-13, 8-13, 9-13, 10-13, 11-13, 12-13, 1-12, 2-12, 3-12, 4-12, 5-12, 6-12, 7-12, 8-12, 9- 12, 10-12, 11-12, 1-11, 2-11, 3-11, 4-11, 5-11, 6-11, 7-11, 8-11, 9-11, 10-11, 1-10, 2-10, 3- 10, 4-10, 5-10, 6-10, 7-10, 8-10, 9-10, 1-9, 2-9, 3-9, 4-9, 5-9, 6-9, 7-9, 8-9, 1-8, 2-8, 3-8, 4-8, 5-8, 6-8, 7-8, 1-7, 2-7, 3-7, 4-7, 5-7, 6-7, 1-6, 2-6, 3-6, 4-6, 5-6, 1-5, 2-5, 3-5, 4-5, 1-4, 2-4, 3- 4, 1-3, 2-3, 1-2, 7-11, 8-11, 9-11, 10-11, 1-10, 2-10, 3-10, 4-10, 5-10, 6-10, 7-10, 8-10, 9-10, 1-9, 2-9, 3-9, 4-9, 5-9, 6-9, 7-9, 8-9, 1-8, 2-8, 3-8, 4-8, 5-8, 6-8, 7-8, 1-7, 2-7, 3-7, 4-7, 5-7, 6- 7, 0-6, 1-6, 2-6, 3-6, 4-6, 5-6, 1-5, 2-5, 3-5, 4-5, 1-4, 2-4, 3-4, 1-3, 2-3, or 1-2 bacterial strains. In some embodiments, the combinations comprise a mixture of bacterial strains that consists of 1-60, 2-60, 3-60, 4-60, 5-60, 6-60, 7-60, 8-60, 9-60, 10-60, 11-60, 12-60, 13-60, 14-60, 15-60, 16-60, 17-60, 18-60, 19-60, 20-60, 21-60, 22-60, 23-60, 24-60, 25-60, 26-60, 27-60, 28-60, 29-60, 30-60, 31-60, 32-60, 33-60, 34-60, 35-60, 36-60, 37-60, 38-60, 39-60, 40-60, 41-60, 42-60, 43-60, 44-60, 45-60, 46-60, 47-60, 48-60, 49-60, 50-60, 51-60, 52-60, 53-60, 54-60, 55-60, 56-60, 57-60, 58-60, 59-60, 1-59, 2-59, 3-59, 4-59, 5-59, 6-59, 7-59, 8- 59, 9-59, 10-59, 11-59, 12-59, 13-59, 14-59, 15-59, 16-59, 17-59, 18-59, 19-59, 20-59, 21-59, 22-59, 23-59, 24-59, 25-59, 26-59, 27-59, 28-59, 29-59, 30-59, 31-59, 32-59, 33-59, 34-59, 35-59, 36-59, 37-59, 38-59, 39-59, 40-59, 41-59, 42-59, 43-59, 44-59, 45-59, 46-59, 47-59, 48-59, 49-59, 50-59, 51-59, 52-59, 53-59, 54-59, 55-59, 56-59, 57-59, 58-59, 1-58, 2-58, 3- 58, 4-58, 5-58, 6-58, 7-58, 8-58, 9-58, 10-58, 11-58, 12-58, 13-58, 14-58, 15-58, 16-58, 17- 58, 18-58, 19-58, 20-58, 21-58, 22-58, 23-58, 24-58, 25-58, 26-58, 27-58, 28-58, 29-58, 30- 58, 31-58, 32-58, 33-58, 34-58, 35-58, 36-58, 37-58, 38-58, 39-58, 40-58, 41-58, 42-58, 43- 58, 44-58, 45-58, 46-58, 47-58, 48-58, 49-58, 50-58, 51-58, 52-58, 53-58, 54-58, 55-58, 56- 58, 57-58, 1-57, 2-57, 3-57, 4-57, 5-57, 6-57, 7-57, 8-57, 9-57, 10-57, 11-57, 12-57, 13-57, 14-57, 15-57, 16-57, 17-57, 18-57, 19-57, 20-57, 21-57, 22-57, 23-57, 24-57, 25-57, 26-57, 27-57, 28-57, 29-57, 30-57, 31-57, 32-57, 33-57, 34-57, 35-57, 36-57, 37-57, 38-57, 39-57, 40-57, 41-57, 42-57, 43-57, 44-57, 45-57, 46-57, 47-57, 48-57, 49-57, 50-57, 51-57, 52-57, 53-57, 54-57, 55-57, 56-57, 1-56, 2-56, 3-56, 4-56, 5-56, 6-56, 7-56, 8-56, 9-56, 10-56, 11- 56, 12-56, 13-56, 14-56, 15-56, 16-56, 17-56, 18-56, 19-56, 20-56, 21-56, 22-56, 23-56, 24- 56, 25-56, 26-56, 27-56, 28-56, 29-56, 30-56, 31-56, 32-56, 33-56, 34-56, 35-56, 36-56, 37- 56, 38-56, 39-56, 40-56, 41-56, 42-56, 43-56, 44-56, 45-56, 46-56, 47-56, 48-56, 49-56, 50- 56, 51-56, 52-56, 53-56, 54-56, 55-56, 1-55, 2-55, 3-55, 4-55, 5-55, 6-55, 7-55, 8-55, 9-55, 10-55, 11-55, 12-55, 13-55, 14-55, 15-55, 16-55, 17-55, 18-55, 19-55, 20-55, 21-55, 22-55, 23-55, 24-55, 25-55, 26-55, 27-55, 28-55, 29-55, 30-55, 31-55, 32-55, 33-55, 34-55, 35-55, 36-55, 37-55, 38-55, 39-55, 40-55, 41-55, 42-55, 43-55, 44-55, 45-55, 46-55, 47-55, 48-55, 49-55, 50-55, 51-55, 52-55, 53-55, 54-55, 1-54, 2-54, 3-54, 4-54, 5-54, 6-54, 7-54, 8-54, 9- 54, 10-54, 11-54, 12-54, 13-54, 14-54, 15-54, 16-54, 17-54, 18-54, 19-54, 20-54, 21-54, 22- 54, 23-54, 24-54, 25-54, 26-54, 27-54, 28-54, 29-54, 30-54, 31-54, 32-54, 33-54, 34-54, 35- 54, 36-54, 37-54, 38-54, 39-54, 40-54, 41-54, 42-54, 43-54, 44-54, 45-54, 46-54, 47-54, 48- 54, 49-54, 50-54, 51-54, 52-54, 53-54, 1-53, 2-53, 3-53, 4-53, 5-53, 6-53, 7-53, 8-53, 9-53, 10-53, 11-53, 12-53, 13-53, 14-53, 15-53, 16-53, 17-53, 18-53, 19-53, 20-53, 21-53, 22-53, 23-53, 24-53, 25-53, 26-53, 27-53, 28-53, 29-53, 30-53, 31-53, 32-53, 33-53, 34-53, 35-53, 36-53, 37-53, 38-53, 39-53, 40-53, 41-53, 42-53, 43-53, 44-53, 45-53, 46-53, 47-53, 48-53, 49-53, 50-53, 51-53, 52-53, 1-52, 2-52, 3-52, 4-52, 5-52, 6-52, 7-52, 8-52, 9-52, 10-52, 11- 52, 12-52, 13-52, 14-52, 15-52, 16-52, 17-52, 18-52, 19-52, 20-52, 21-52, 22-52, 23-52, 24- 52, 25-52, 26-52, 27-52, 28-52, 29-52, 30-52, 31-52, 32-52, 33-52, 34-52, 35-52, 36-52, 37- 52, 38-52, 39-52, 40-52, 41-52, 42-52, 43-52, 44-52, 45-52, 46-52, 47-52, 48-52, 49-52, 50- 52, 51-52, 1-51, 2-51, 3-51, 4-51, 5-51, 6-51, 7-51, 8-51, 9-51, 10-51, 11-51, 12-51, 13-51, 14-51, 15-51, 16-51, 17-51, 18-51, 19-51, 20-51, 21-51, 22-51, 23-51, 24-51, 25-51, 26-51, 27-51, 28-51, 29-51, 30-51, 31-51, 32-51, 33-51, 34-51, 35-51, 36-51, 37-51, 38-51, 39-51, 40-51, 41-51, 42-51, 43-51, 44-51, 45-51, 46-51, 47-51, 48-51, 49-51, 50-51, 1-50, 2-50, 3- 50, 4-50, 5-50, 6-50, 7-50, 8-50, 9-50, 10-50, 11-50, 12-50, 13-50, 14-50, 15-50, 16-50, 17- 50, 18-50, 19-50, 20-50, 21-50, 22-50, 23-50, 24-50, 25-50, 26-50, 27-50, 28-50, 29-50, 30- 50, 31-50, 32-50, 33-50, 34-50, 35-50, 36-50, 37-50, 38-50, 39-50, 40-50, 41-50, 42-50, 43- 50, 44-50, 45-50, 46-50, 47-50, 48-50, 49-50, 1-49, 2-49, 3-49, 4-49, 5-49, 6-49, 7-49, 8-49, 9-49, 10-49, 11-49, 12-49, 13-49, 14-49, 15-49, 16-49, 17-49, 18-49, 19-49, 20-49, 21-49, 22-49, 23-49, 24-49, 25-49, 26-49, 27-49, 28-49, 29-49, 30-49, 31-49, 32-49, 33-49, 34-49, 35-49, 36-49, 37-49, 38-49, 39-49, 40-49, 41-49, 42-49, 43-49, 44-49, 45-49, 46-49, 47-49, 48-49, 1-48, 2-48, 3-48, 4-48, 5-48, 6-48, 7-48, 8-48, 9-48, 10-48, 11-48, 12-48, 13-48, 14- 48, 15-48, 16-48, 17-48, 18-48, 19-48, 20-48, 21-48, 22-48, 23-48, 24-48, 25-48, 26-48, 27- 48, 28-48, 29-48, 30-48, 31-48, 32-48, 33-48, 34-48, 35-48, 36-48, 37-48, 38-48, 39-48, 40- 48, 41-48, 42-48, 43-48, 44-48, 45-48, 46-48, 47-48, 1-47, 2-47, 3-47, 4-47, 5-47, 6-47, 7-47, 8-47, 9-47, 10-47, 11-47, 12-47, 13-47, 14-47, 15-47, 16-47, 17-47, 18-47, 19-47, 20-47, 21- 47, 22-47, 23-47, 24-47, 25-47, 26-47, 27-47, 28-47, 29-47, 30-47, 31-47, 32-47, 33-47, 34- 47, 35-47, 36-47, 37-47, 38-47, 39-47, 40-47, 41-47, 42-47, 43-47, 44-47, 45-47, 46-47, 1-46, 2-46, 3-46, 4-46, 5-46, 6-46, 7-46, 8-46, 9-46, 10-46, 11-46, 12-46, 13-46, 14-46, 15-46, 16- 46, 17-46, 18-46, 19-46, 20-46, 21-46, 22-46, 23-46, 24-46, 25-46, 26-46, 27-46, 28-46, 29- 46, 30-46, 31-46, 32-46, 33-46, 34-46, 35-46, 36-46, 37-46, 38-46, 39-46, 40-46, 41-46, 42- 46, 43-46, 44-46, 45-46, 1-45, 2-45, 3-45, 4-45, 5-45, 6-45, 7-45, 8-45, 9-45, 10-45, 11-45, 12-45, 13-45, 14-45, 15-45, 16-45, 17-45, 18-45, 19-45, 20-45, 21-45, 22-45, 23-45, 24-45, 25-45, 26-45, 27-45, 28-45, 29-45, 30-45, 31-45, 32-45, 33-45, 34-45, 35-45, 36-45, 37-45, 38-45, 39-45, 40-45, 41-45, 42-45, 43-45, 44-45, 1-44, 2-44, 3-44, 4-44, 5-44, 6-44, 7-44, 8- 44, 9-44, 10-44, 11-44, 12-44, 13-44, 14-44, 15-44, 16-44, 17-44, 18-44, 19-44, 20-44, 21-44, 22-44, 23-44, 24-44, 25-44, 26-44, 27-44, 28-44, 29-44, 30-44, 31-44, 32-44, 33-44, 34-44, 35-44, 36-44, 37-44, 38-44, 39-44, 40-44, 41-44, 42-44, 43-44, 1-43, 2-43, 3-43, 4-43, 5-43, 6-43, 7-43, 8-43, 9-43, 10-43, 11-43, 12-43, 13-43, 14-43, 15-43, 16-43, 17-43, 18-43, 19-43, 20-43, 21-43, 22-43, 23-43, 24-43, 25-43, 26-43, 27-43, 28-43, 29-43, 30-43, 31-43, 32-43, 33-43, 34-43, 35-43, 36-43, 37-43, 38-43, 39-43, 40-43, 41-43, 42-43, 1-42, 2-42, 3-42, 4-42, 5-42, 6-42, 7-42, 8-42, 9-42, 10-42, 11-42, 12-42, 13-42, 14-42, 15-42, 16-42, 17-42, 18-42, 19-42, 20-42, 21-42, 22-42, 23-42, 24-42, 25-42, 26-42, 27-42, 28-42, 29-42, 30-42, 31-42, 32-42, 33-42, 34-42, 35-42, 36-42, 37-42, 38-42, 39-42, 40-42, 41-42, 1-41, 2-41, 3-41, 4-41, 5-41, 6-41, 7-41, 8-41, 9-41, 10-41, 11-41, 12-41, 13-41, 14-41, 15-41, 16-41, 17-41, 18-41, 19-41, 20-41, 21-41, 22-41, 23-41, 24-41, 25-41, 26-41, 27-41, 28-41, 29-41, 30-41, 31-41, 32-41, 33-41, 34-41, 35-41, 36-41, 37-41, 38-41, 39-41, 40-41, 1-40, 2-40, 3-40, 4-40, 5-40, 6-40, 7-40, 8-40, 9-40, 10-40, 11-40, 12-40, 13-40, 14-40, 15-40, 16-40, 17-40, 18-40, 19-40, 20-40, 21-40, 22-40, 23-40, 24-40, 25-40, 26-40, 27-40, 28-40, 29-40, 30-40, 31-40, 32-40, 33-40, 34-40, 35-40, 36-40, 37-40, 38-40, 39-40, 1-39, 2-39, 3-39, 4-39, 5-39, 6-39, 7-39, 8- 39, 9-39, 10-39, 11-39, 12-39, 13-39, 14-39, 15-39, 16-39, 17-39, 18-39, 19-39, 20-39, 21-39, 22-39, 23-39, 24-39, 25-39, 26-39, 27-39, 28-39, 29-39, 30-39, 31-39, 32-39, 33-39, 34-39, 35-39, 36-39, 37-39, 38-39, 1-38, 2-38, 3-38, 4-38, 5-38, 6-38, 7-38, 8-38, 9-38, 10-38, 11- 38, 12-38, 13-38, 14-38, 15-38, 16-38, 17-38, 18-38, 19-38, 20-38, 21-38, 22-38, 23-38, 24- 38, 25-38, 26-38, 27-38, 28-38, 29-38, 30-38, 31-38, 32-38, 33-38, 34-38, 35-38, 36-38, 37- 38, 1-37, 2-37, 3-37, 4-37, 5-37, 6-37, 7-37, 8-37, 9-37, 10-37, 11-37, 12-37, 13-37, 14-37, 15-37, 16-37, 17-37, 18-37, 19-37, 20-37, 21-37, 22-37, 23-37, 24-37, 25-37, 26-37, 27-37, 28-37, 29-37, 30-37, 31-37, 32-37, 33-37, 34-37, 35-37, 36-37, 1-36, 2-36, 3-36, 4-36, 5-36, 6-36, 7-36, 8-36, 9-36, 10-36, 11-36, 12-36, 13-36, 14-36, 15-36, 16-36, 17-36, 18-36, 19-36, 20-36, 21-36, 22-36, 23-36, 24-36, 25-36, 26-36, 27-36, 28-36, 29-36, 30-36, 31-36, 32-36, 33-36, 34-36, 35-36, 1-35, 2-35, 3-35, 4-35, 5-35, 6-35, 7-35, 8-35, 9-35, 10-35, 11-35, 12- 35, 13-35, 14-35, 15-35, 16-35, 17-35, 18-35, 19-35, 20-35, 21-35, 22-35, 23-35, 24-35, 25- 35, 26-35, 27-35, 28-35, 29-35, 30-35, 31-35, 32-35, 33-35, 34-35, 1-34, 2-34, 3-34, 4-34, 5- 34, 6-34, 7-34, 8-34, 9-34, 10-34, 11-34, 12-34, 13-34, 14-34, 15-34, 16-34, 17-34, 18-34, 19-34, 20-34, 21-34, 22-34, 23-34, 24-34, 25-34, 26-34, 27-34, 28-34, 29-34, 30-34, 31-34, 32-34, 33-34, 1-33, 2-33, 3-33, 4-33, 5-33, 6-33, 7-33, 8-33, 9-33, 10-33, 11-33, 12-33, 13- 33, 14-33, 15-33, 16-33, 17-33, 18-33, 19-33, 20-33, 21-33, 22-33, 23-33, 24-33, 25-33, 26- 33, 27-33, 28-33, 29-33, 30-33, 31-33, 32-33, 1-32, 2-32, 3-32, 4-32, 5-32, 6-32, 7-32, 8-32, 9-32, 10-32, 11-32, 12-32, 13-32, 14-32, 15-32, 16-32, 17-32, 18-32, 19-32, 20-32, 21-32, 22-32, 23-32, 24-32, 25-32, 26-32, 27-32, 28-32, 29-32, 30-32, 31-32, 1-31, 2-31, 3-31, 4-31, 5-31, 6-31, 7-31, 8-31, 9-31, 10-31, 11-31, 12-31, 13-31, 14-31, 15-31, 16-31, 17-31, 18-31, 19-31, 20-31, 21-31, 22-31, 23-31, 24-31, 25-31, 26-31, 27-31, 28-31, 29-31, 30-31, 1-30, 2- 30, 3-30, 4-30, 5-30, 6-30, 7-30, 8-30, 9-30, 10-30, 11-30, 12-30, 13-30, 14-30, 15-30, 16-30, 17-30, 18-30, 19-30, 20-30, 21-30, 22-30, 23-30, 24-30, 25-30, 26-30, 27-30, 28-30, 29-30, 1-29, 2-29, 3-29, 4-29, 5-29, 6-29, 7-29, 8-29, 9-29, 10-29, 11-29, 12-29, 13-29, 14-29, 15- 29, 16-29, 17-29, 18-29, 19-29, 20-29, 21-29, 22-29, 23-29, 24-29, 25-29, 26-29, 27-29, 28- 29, 1-28, 2-28, 3-28, 4-28, 5-28, 6-28, 7-28, 8-28, 9-28, 10-28, 11-28, 12-28, 13-28, 14-28, 15-28, 16-28, 17-28, 18-28, 19-28, 20-28, 21-28, 22-28, 23-28, 24-28, 25-28, 26-28, 27-28, 1-27, 2-27, 3-27, 4-27, 5-27, 6-27, 7-27, 8-27, 9-27, 10-27, 11-27, 12-27, 13-27, 14-27, 15- 27, 16-27, 17-27, 18-27, 19-27, 20-27, 21-27, 22-27, 23-27, 24-27, 25-27, 26-27, 1-26, 2-26, 3-26, 4-26, 5-26, 6-26, 7-26, 8-26, 9-26, 10-26, 11-26, 12-26, 13-26, 14-26, 15-26, 16-26, 17- 26, 18-26, 19-26, 20-26, 21-26, 22-26, 23-26, 24-26, 25-26, 1-25, 2-25, 3-25, 4-25, 5-25, 6- 25, 7-25, 8-25, 9-25, 10-25, 11-25, 12-25, 13-25, 14-25, 15-25, 16-25, 17-25, 18-25, 19-25, 20-25, 21-25, 22-25, 23-25, 24-25, 1-24, 2-24, 3-24, 4-24, 5-24, 6-24, 7-24, 8-24, 9-24, 10- 24, 11-24, 12-24, 13-24, 14-24, 15-24, 16-24, 17-24, 18-24, 19-24, 20-24, 21-24, 22-24, 23- 24, 1-23, 2-23, 3-23, 4-23, 5-23, 6-23, 7-23, 8-23, 9-23, 10-23, 11-23, 12-23, 13-23, 14-23, 15-23, 16-23, 17-23, 18-23, 19-23, 20-23, 21-23, 22-23, 1-22, 2-22, 3-22, 4-22, 5-22, 6-22, 7- 22, 8-22, 9-22, 10-22, 11-22, 12-22, 13-22, 14-22, 15-22, 16-22, 17-22, 18-22, 19-22, 20-22, 21-22, 1-21, 2-21, 3-21, 4-21, 5-21, 6-21, 7-21, 8-21, 9-21, 10-21, 11-21, 12-21, 13-21, 14- 21, 15-21, 16-21, 17-21, 18-21, 19-21, 20-21, 1-20, 2-20, 3-20, 4-20, 5-20, 6-20, 7-20, 8-20, 9-20, 10-20, 11-20, 12-20, 13-20, 14-20, 15-20, 16-20, 17-20, 18-20, 19-20, 1-19, 2-19, 3-19, 4-19, 5-19, 6-19, 7-19, 8-19, 9-19, 10-19, 11-19, 12-19, 13-19, 14-19, 15-19, 16-19, 17-19, 18-19, 1-18, 2-18, 3-18, 4-18, 5-18, 6-18, 7-18, 8-18, 9-18, 10-18, 11-18, 12-18, 13-18, 14- 18, 15-18, 16-18, 17-18, 1-17, 2-17, 3-17, 4-17, 5-17, 6-17, 7-17, 8-17, 9-17, 10-17, 11-17, 12-17, 13-17, 14-17, 15-17, 16-17, 1-16, 2-16, 3-16, 4-16, 5-16, 6-16, 7-16, 8-16, 9-16, 10- 16, 11-16, 12-16, 13-16, 14-16, 15-16, 1-15, 2-15, 3-15, 4-15, 5-15, 6-15, 7-15, 8-15, 9-15, 10-15, 11-15, 12-15, 13-15, 14-15, 1-14, 2-14, 3-14, 4-14, 5-14, 6-14, 7-14, 8-14, 9-14, 10- 14, 11-14, 12-14, 13-14, 1-13, 2-13, 3-13, 4-13, 5-13, 6-13, 7-13, 8-13, 9-13, 10-13, 11-13, 12-13, 1-12, 2-12, 3-12, 4-12, 5-12, 6-12, 7-12, 8-12, 9-12, 10-12, 11-12, 1-11, 2-11, 3-11, 4- 11, 5-11, 6-11, 7-11, 8-11, 9-11, 10-11, 1-10, 2-10, 3-10, 4-10, 5-10, 6-10, 7-10, 8-10, 9-10, 1-9, 2-9, 3-9, 4-9, 5-9, 6-9, 7-9, 8-9, 1-8, 2-8, 3-8, 4-8, 5-8, 6-8, 7-8, 1-7, 2-7, 3-7, 4-7, 5-7, 6- 7, 1-6, 2-6, 3-6, 4-6, 5-6, 1-5, 2-5, 3-5, 4-5, 1-4, 2-4, 3-4, 1-3, 2-3, 1-2, 7-11, 8-11, 9-11, 10- 11, 1-10, 2-10, 3-10, 4-10, 5-10, 6-10, 7-10, 8-10, 9-10, 1-9, 2-9, 3-9, 4-9, 5-9, 6-9, 7-9, 8-9, 1-8, 2-8, 3-8, 4-8, 5-8, 6-8, 7-8, 1-7, 2-7, 3-7, 4-7, 5-7, 6-7, 0-6, 1-6, 2-6, 3-6, 4-6, 5-6, 1-5, 2- 5, 3-5, 4-5, 1-4, 2-4, 3-4, 1-3, 2-3, or 1-2 bacterial strains. 16S rDNA sequences of bacterial strains Some aspects of the disclosure relate to bacterial strains with 16S rDNA sequences that have sequence identity to a nucleic acid sequence of any one of the sequences of the bacterial strains or species described herein. As will be appreciated by one of ordinary skill in the art, the 16S rDNA sequences represent DNA sequences corresponding to the 16S rRNA sequence. The terms “identical,” or percent “identity,” in the context of two or more nucleic acids or amino acid sequences, refer to two or more sequences or subsequences that are the same. Two sequences are “substantially identical” if two sequences have a specified percentage of amino acid residues or nucleotides that are the same (e.g., at least 80%, 85%, 90%, 95%, 96%, 97%, 98%, 99%, 99.5%, 99.6%, 99.7%, 99.8% or 99.9% sequence identity) over a specified region of a nucleic acid or amino acid sequence or over the entire sequence, when compared and aligned for maximum correspondence over a comparison window, or designated region as measured using one of the following sequence comparison algorithms or by manual alignment and visual inspection. Optionally, the identity exists over a region that is at least about 50 nucleotides in length, or more preferably over a region that is 100 to 500 or 1000 or more nucleotides in length. In some embodiments, the identity exists over the length the 16S rRNA or 16S rDNA sequence. For sequence comparison, typically one sequence acts as a reference sequence, to which test sequences are compared. Methods of alignment of sequences for comparison are well known in the art. See, e.g., by the local homology algorithm of Smith and Waterman (1970) Adv. Appl. Math.2:482c, by the homology alignment algorithm of Needleman and Wunsch, J. Mol. Biol.48:443, 1970, by the search for similarity method of Pearson and Lipman. Proc. Natl. Acad. Sci. USA 85:2444, 1988, by computerized implementations of these algorithms (GAP, BESTFIT, FASTA, and TFASTA in the Wisconsin Genetics Software Package, Genetics Computer Group. Madison. WI), or by manual alignment and visual inspection (see. e.g., Brent et al., Current Protocols in Molecular Biology, John Wiley & Sons, Inc. (Ringbou ed., 2003)). Two examples of algorithms that are suitable for determining percent sequence identity and sequence similarity are the BLAST and BLAST 2.0 algorithms, which are described in Altschul et al., Nuc. Acids Res.25:3389-3402, 1977; and Altschul et al., J. Mol. Biol.215:403-410, 1990, respectively. In some embodiments, a bacterial strain has at least 60%, at least 70%, at least 80%, at least 81%, at least 82%, at least 83%, at least 84%, at least 85%, at least 86%, at least 87%, at least 88%, at least 89%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, at least 99.5%, at least 99.6%, at least 99.7%, at least 99.8%, at least 99.9%, or up to 100% sequence identity relative to any of the strains or bacterial species described herein over a specified region or over the entire sequence. It would be appreciated by one of skill in the art that the term “sequence identity” or “percent sequence identity,” in the context of two or more nucleic acid sequences or amino acid sequences, refers to a measure of similarity between two or more sequences or portion(s) thereof. Additionally, or alternatively, two or more sequences may be assessed for the alignment between the sequences. The terms “alignment” or percent “alignment” in the context of two or more nucleic acids or amino acid sequences, refer to two or more sequences or subsequences that are the same. Two sequences are “substantially aligned” if two sequences have a specified percentage of amino acid residues or nucleotides that are the same (e.g., at least 80%, 85%, 90%, 95%, 96%, 97%, 98%, 99%, 99.5%, 99.6%, 99.7%, 99.8% or 99.9% identical) over a specified region or over the entire sequence, when compared and aligned for maximum correspondence over a comparison window, or designated region as measured using one of the following sequence comparison algorithms or by manual alignment and visual inspection. Optionally, the alignment exists over a region that is at least about 50 nucleotides in length, or more preferably over a region that is 100 to 500 or 1000 or more nucleotides in length. In some embodiments, the identity exists over the length the 16S rRNA or 16S rDNA sequence. Some aspects of the disclosure relate to combinations comprising at least two of (i) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 354-356; (ii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 409-411; and (iii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 492-499. In some embodiments, the combination comprises each of (i) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 354-356; (ii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 409-411; and (iii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 492- 499. In some embodiments, the combination further comprises one or more of (i) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 37-38; (ii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 39-125; (iii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 392-394; (iv) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 395-400; (v) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 403; and (vi) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 518-519. In some embodiments, the combination comprises two of (i) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 37-38; (ii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 39-125; (iii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 392-394; (iv) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 395-400; (v) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 403; and (vi) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 518- 519. In some embodiments, the combination comprises three of (i) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 37-38; (ii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 39-125; (iii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 392-394; (iv) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 395-400; (v) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 403; and (vi) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 518- 519. In some embodiments, the combination comprises four of (i) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 37-38; (ii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 39-125; (iii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 392-394; (iv) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 395-400; (v) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 403; and (vi) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 518- 519. In some embodiments, the combination comprises five of (i) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 37-38; (ii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 39-125; (iii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 392-394; (iv) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 395-400; (v) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 403; and (vi) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 518- 519. In some embodiments, the combination comprises each of (i) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 37-38; (ii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 39-125; (iii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 392-394; (iv) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 395-400; (v) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 403; and (vi) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 518- 519. In some embodiments, the combination further comprises one or more of (i) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 126-353; (ii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 401; (iii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 402; (iv) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 404; and (v) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 510-517. In some embodiments, the combination further comprises two of (i) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 126-353; (ii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 401; (iii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 402; (iv) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 404; and (v) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs; 510-517. In some embodiments, the combination further comprises three of (i) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 126-353; (ii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 401; (iii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 402; (iv) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 404; and (v) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 510-517. In some embodiments, the combination further comprises four of (i) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 126-353; (ii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 401; (iii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 402; (iv) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 404; and (v) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 510-517. In some embodiments, the combination further comprises each of (i) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 126-353; (ii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 401; (iii) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 402; (iv) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 404; and (v) a bacterial strain comprising a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 510-517. A combination that includes a bacterial strain having a 16S rDNA sequence with a certain sequence identity (e.g., 95%) to a sequence (i.e., comprises a given strain, or consists of a combination of strains, at least one having 16S rDNA sequence a certain sequence identity to the reference sequence) may comprise any number of bacterial strains having the specified sequence identity to that sequence. In some embodiments, the combination that comprises a bacterial strain having at least 95% sequence identity to any one of SEQ ID NOs: 354-356, 409-411, and 492-499 further comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains, each having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 354-356. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains, each having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 409-411. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains, each having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 492-499. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains, each having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 37-38. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains, each having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 39-125. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains, each having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 392-394. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains, each having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 395-400. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains, each having a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 403. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains, each having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 518-519. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains, each having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 126-353. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains, each having a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 401. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains, each having a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 402. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains, each having a 16S rDNA sequence with at least 95% sequence identity to SEQ ID NO: 404. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 different bacterial strains, each having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 510-517. Bacterial strains with closely related 16S rDNA sequences may be distinguished using one or more of multiple features known in the art, such as colony morphology (e.g., smooth v. rough, flat v. raised, color). Bacterial strains with closely related 16S rDNA sequences may also be distinguished on the basis of presence or absence of one or more genes, such as antibiotic resistance genes. In some embodiments, the combination described herein does not comprise a bacterial strain having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 382-391. Combinations may be said not to comprise (i.e., to lack) bacterial strains with 16S rDNA sequences related to a given sequences if bacteria having 16S rDNA sequences with the specified identity (e.g., 95%) are not detectable in the combination above a limit of detection. Methods of detecting bacterial strains of a given species are known in the art, including amplification, sequencing, and identification of 16S rDNA isolated from a biological sample (e.g., combination). In some embodiments, at least two bacterial strains, each having a 16S rDNA sequence with at least 95% sequence identity to a sequence independently selected from any one of SEQ ID NOs: 357-381, 405-408, 412-491, and 500-509, are not present in the combination. For example, in some embodiments, the combination does not comprise a bacterial strain having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 357-381, and does not comprise a bacterial strain with at least 95% sequence identity to any one of SEQ ID NOs: 405-408. In some embodiments, the combination does not comprise at least two of (a) a bacterial strain having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 357-381; (b) a bacterial strain having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 405-408; (c) a bacterial strain having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 412-491; and (d) a bacterial strain having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 500- 509. In some embodiments, the combination does not comprise at least three of (a) a bacterial strain having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs:.357-381; (b) a bacterial strain having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 405-408; (c) a bacterial strain having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 412- 491; and (d) a bacterial strain having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 500-509. In some embodiments, the combination (a) does not comprise a bacterial strain having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 357- 381; (b) does not comprise a bacterial strain having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 405-408; (c) does not comprise a bacterial strain having a 16S rDNA sequence with at least 95% sequence identity to any one of SEQ ID NOs: 412-491; and (d) does not comprise a bacterial strain having a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 500-509. Some aspects of the disclosure relate to combinations comprising at least 2 of: two or more of : (1) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 1; (2) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 2; (3) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 3; (4) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 4; (5) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 5; (6) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 6; (7) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 7; (8) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 8; (9) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 9; (10) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 10; (11) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 11; (12) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 12; (13) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 13; (14) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 14; (15) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 15; (16) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 16; (17) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 17; (18) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 18; (19) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 19; (20) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 20; (21) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 21; (22) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 22; (23) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 23; (24) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 24; (25) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 25; (26) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 26; (27) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 27; (28) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 28; (29) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 29; (30) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 30; (31) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 31; (32) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 32; (33) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 33; (34) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 34; (35) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 35; and (36) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 36. Some aspects of the disclosure relate to combinations comprising at least 2 of: two or more of: (1) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 1; (2) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 2; (3) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 3; (4) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 4; (5) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 5; (6) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 6; (7) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 7; (8) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 8; (9) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 9; (10) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 10; (11) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 11; (12) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 12; (13) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 13; (14) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 14; (15) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 15; (16) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 16; (17) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 17; (18) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 18; (19) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 19; (20) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 20; (21) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 21; (22) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 22; (23) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 23; (24) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 24; (25) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 25; (26) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 26; (27) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 27; (28) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 28; (29) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 29; (30) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 30; (31) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 31; (32) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 32; (33) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 33; (34) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 34; (35) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 35; and (36) an isolated bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 36. In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 3 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 4 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 5 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 6 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 7 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 8 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 9 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 10 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 11 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 12 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 13 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 14 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 15 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 16 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 17 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 18 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 19 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 20 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 21 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 22 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 23 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 24 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 25 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 26 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 27 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 28 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 29 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 30 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 31 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 32 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 33 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 34 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises isolated bacterial strains that collectively include at least 35 of the bacterial strains of (1)-(36). In some embodiments, the combination comprises each of the bacterial strains of (1)-(36). In some embodiments, substantially all bacteria in the combination are bacterial strains of (1)-(36). In some embodiments, the combination does not comprise bacterial strains other than one or more bacterial strains of (1)-(36) above a limit of detection. Combinations described herein may include one or more additional bacterial strains. Additional bacterial strains may be taxonomically or phylogenetically related to bacterial strains having 16S rDNA sequences of any one of SEQ ID NOs: 1-36. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 1. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 1. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 1. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 1. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 2. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 2. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 2. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 2. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 3. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 3. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 3. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 3. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 4. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 4. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 4. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 4. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 5. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 5. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 5. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 5. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 6. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 6. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 6. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 6. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 7. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 7. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 7. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 7. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 8. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 8. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 8. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 8. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 9. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 9. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 9. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 9. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 10. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 10. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 10. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 10. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 11. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 11. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 11. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 11. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 12. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 12. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 12. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 12. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 13. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 13. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 13. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 13. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 14. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 14. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 14. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 14. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 15. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 15. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 15. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 15. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 16. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 16. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 16. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 16. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 17. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 17. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 17. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 17. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 18. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 18. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 18. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 18. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 19. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 19. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 19. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 19. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 20. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 20. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 20. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 20. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 21. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 21. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 21. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 21. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 22. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 22. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 22. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 22. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 23. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 23. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 23. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 23. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 24. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 24. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 24. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 24. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 25. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 25. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 25. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 25. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 26. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 26. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 26. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 26. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 27. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 27. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 27. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 27. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 28. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 28. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 28. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 28. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 29. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 29. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 29. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 29. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 30. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 30. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 30. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 30. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 31. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 31. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 31. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 31. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 32. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 32. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 32. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 32. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 33. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 33. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 33. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 33. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 34. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 34. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 34. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 34. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 35. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 35. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 35. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 35. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 90% sequence identity to SEQ ID NO: 36. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 95% sequence identity to SEQ ID NO: 36. In some embodiments, one or more additional bacterial strains have 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 36. In some embodiments, the combination comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 additional bacterial strains comprising 16S rDNA sequences with at least 97% sequence identity to SEQ ID NO: 36. In some embodiments, the combination comprises additional bacterial strains having 16S rDNA sequences with at least 97% sequence identity to 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, or 36 of SEQ ID NOs: 1-36. In some embodiments, the combination comprises at least five additional bacterial strains having at least 97% sequence identity to at least five of SEQ ID NOs: 1-36. In some embodiments, the combination comprises at least 10 additional bacterial strains having at least 97% sequence identity to at least 10 of SEQ ID NOs: 1-36. In some embodiments, the combination comprises at least 15 additional bacterial strains having at least 97% sequence identity to at least 15 of SEQ ID NOs: 1-36. In some embodiments, the combination comprises at least 20 additional bacterial strains having at least 97% sequence identity to at least 20 of SEQ ID NOs: 1-36. In some embodiments, the combination comprises at least 25 additional bacterial strains having at least 97% sequence identity to at least 25 of SEQ ID NOs: 1-36. In some embodiments, the combination comprises at least 30 additional bacterial strains having at least 97% sequence identity to at least 30 of SEQ ID NOs: 1-36. In some embodiments, the combination comprises at least 35 additional bacterial strains having at least 97% sequence identity to at least 35 of SEQ ID NOs: 1-36. In some embodiments, the combination comprises at least 36 additional bacterial strains having at least 97% sequence identity to SEQ ID NOs: 1-36. In some embodiments, the combination comprises one or more bacterial strains comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 520-614.16S rDNA sequences of SEQ ID NOs: 520-614, listed in Table 3, are representative of bacterial strains detected in subjects receiving FMT from a donor whose microbiota were associated with alleviation of inflammatory bowel disease (IBD) symptoms. The number of subjects in which these bacterial strains were detected, their abundance, and associated species and genus names are also provided in Table 3. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 520. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 521-524. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 521. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 522. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 523. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 524. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 525-526. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 525. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 526. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 527. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 528-532. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 528. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 529. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 530. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 531. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 532. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 533. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 534. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 535. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 536-538. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 536. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 537. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 538. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 539-541. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 539. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 540. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 541. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 542-544. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 542. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 543. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 544. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 545. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 546-547. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 546. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 547. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 548. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 549. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 550-551. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 550. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 551. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 552. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NO: 553-555. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 553. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 554. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 555. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 556-557. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 556. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 557. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 558. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 559. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 560. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 561. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 562-565. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 562. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 563. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 564. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 565. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 566-571. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 566. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 567. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 568. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 569. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 570. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 571. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 572-573. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 572. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 573. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 574. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 575-578. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 575. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 576. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 577. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 578. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 579. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 580. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 581. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 582-583. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 582. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 583. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 584-585. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 584. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 585. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 586-592. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 586. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 587. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 588. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 589. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 590. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 591. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 592. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 593-594. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 593. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 594. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 595. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 596. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 597. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 598. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 599-600. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 599. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 600. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 601-604. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 601. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 602. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 603. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 604. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 605. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 606-609. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 606. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 607. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 608. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 609. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 610. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to any one of SEQ ID NOs: 611-613. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 611. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 612. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 613. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to SEQ ID NO: 614. In some embodiments, the combination comprises one or more bacterial strains comprising a 16S rDNA sequence with at least 99% sequence identity to any one of SEQ ID NOs: 520-614. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 520. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to any one of SEQ ID NOs: 521-524. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 521. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 522. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 523. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 524. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to any one of SEQ ID NOs: 525-526. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 525. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 526. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 527. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to any one of SEQ ID NOs: 528-532. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 528. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 529. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 530. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 531. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 532. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 533. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 534. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 535. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to any one of SEQ ID NOs: 536-538. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 536. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 537. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 538. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to any one of SEQ ID NOs: 539-541. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 539. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 540. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity to SEQ ID NO: 541. In some embodiments, the combination comprises a bacterial strain comprising a 16S rDNA sequence with at least 99% sequence identity t...

Claims

CLAIMS What is claimed is:

1. A method of treating an inflammatory bowel disease (IBD) in a subject in need thereof by administering to the subject a combination comprising two or more of: (1) an isolated bacterial strain belonging to the species Bacteroides caccae; (2) an isolated bacterial strain belonging to the species Bacteroides intestinalis; (3) an isolated bacterial strain belonging to the species Bacteroides faecis; (4) an isolated bacterial strain belonging to the species Bacteroides ovatus; (5) an isolated bacterial strain belonging to the species Bacteroides thetaiotaomicron; (6) an isolated bacterial strain belonging to the species Bacteroides uniformis; (7) an isolated bacterial strain belonging to the species Bacteroides vulgatus; (8) an isolated bacterial strain belonging to the species Bifidobacterium adolescentis; (9) an isolated bacterial strain belonging to the species Bifidobacterium longum; (10) an isolated bacterial strain belonging to the species Bifidobacterium pseudocatenulatum; (11) an isolated bacterial strain belonging to the species Blautia producta; (12) an isolated bacterial strain belonging to the species Clostridium citroniae; (13) an isolated bacterial strain belonging to the species Clostridium clostridioforme; (14) a first isolated bacterial strain belonging to the species Clostridium innocuum; (15) a second isolated bacterial strain belonging to the species Clostridium innocuum; (16) an isolated bacterial strain belonging to the species Paeniclostridium sordellii; (17) an isolated bacterial strain belonging to the species Coprococcus comes; (18) an isolated bacterial strain belonging to the species Dorea longicatena; (19) an isolated bacterial strain belonging to the species Erysipelatoclostridium ramosum; (20) an isolated bacterial strain belonging to the species Eubacterium rectale; (21) an isolated bacterial strain belonging to the species Odoribacter sp.; (22) an isolated bacterial strain belonging to the species Parabacteroides distasonis;(23) an isolated bacterial strain belonging to the species Parabacteroides merdae; (24) an isolated bacterial strain belonging to the species Bacteroides xylanisolvens; (25) an isolated bacterial strain belonging to the species Blautia obeum; (26) an isolated bacterial strain belonging to the species Alistipes putredinis; (27) an isolated bacterial strain belonging to the species Collinsella aerofaciens; (28) an isolated bacterial strain belonging to the species Eubacterium hallii; (29) an isolated bacterial strain belonging to the species Alistipes shahii; (30) an isolated bacterial strain belonging to the species Anaerostipes caccae; (31) an isolated bacterial strain belonging to the species Phascolarctobacterium faecium; (32) an isolated bacterial strain belonging to the species Agathobaculum butyriciproducens; (33) an isolated bacterial strain belonging to the species Bacteroides fragilis; (34) an isolated bacterial strain belonging to the species Fusobacterium mortiferum; (35) an isolated bacterial strain belonging to the species Paraclostridium bifermentans; and (36) an isolated bacterial strain belonging to the species Escherichia coli, in a therapeutically effective amount to induce proliferation and / or accumulation of regulatory T cells in an intestine of the subject.

2. A method of treating an inflammatory bowel disease (IBD) in a subject in need thereof by administering to the subject a combination comprising two or more of: (1) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 1; (2) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 2; (3) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 3; (4) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 4; (5) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 5;(6) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 6; (7) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 7; (8) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 8; (9) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 9; (10) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 10; (11) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 11; (12) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 12; (13) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 13; (14) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 14; (15) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 15; (16) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 16; (17) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 17; (18) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 18; (19) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 19; (20) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 20; (21) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 21; (22) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 22;(23) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 23; (24) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 24; (25) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 25; (26) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 26; (27) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 27; (28) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 28; (29) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 29; (30) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 30; (31) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 31; (32) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 32; (33) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 33; (34) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 34; (35) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 35; and (36) an isolated bacterial strain comprising a 16S rDNA sequence with at least 97% sequence identity to the nucleotide sequence of SEQ ID NO: 36, in a therapeutically effective amount to induce proliferation and / or accumulation of regulatory T cells in an intestine of the subject.

3. The method of claim 2, wherein: the isolated bacterial strain of (1) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 1;the isolated bacterial strain of (2) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 2; the isolated bacterial strain of (3) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 3; the isolated bacterial strain of (4) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 4; the isolated bacterial strain of (5) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 5; the isolated bacterial strain of (6) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 6; the isolated bacterial strain of (7) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 7; the isolated bacterial strain of (8) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 8; the isolated bacterial strain of (9) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 9; the isolated bacterial strain of (10) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 10; the isolated bacterial strain of (11) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 11; the isolated bacterial strain of (12) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 12; the isolated bacterial strain of (13) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 13; the isolated bacterial strain of (14) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 14; the isolated bacterial strain of (15) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 15; the isolated bacterial strain of (16) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 16; the isolated bacterial strain of (17) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 17; the isolated bacterial strain of (18) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 18;the isolated bacterial strain of (19) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 19; the isolated bacterial strain of (20) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 20; the isolated bacterial strain of (21) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 21; the isolated bacterial strain of (22) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 22; the isolated bacterial strain of (23) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 23; the isolated bacterial strain of (24) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 24; the isolated bacterial strain of (25) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 25; the isolated bacterial strain of (26) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 26; the isolated bacterial strain of (27) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 27; the isolated bacterial strain of (28) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 28; the isolated bacterial strain of (29) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 29; the isolated bacterial strain of (30) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 30; the isolated bacterial strain of (31) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 31; the isolated bacterial strain of (32) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 32; the isolated bacterial strain of (33) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 33; the isolated bacterial strain of (34) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 34; the isolated bacterial strain of (35) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO: 35; andthe isolated bacterial strain of (36) comprises a 16S rDNA sequence with at least 99% sequence identity to the nucleotide sequence of SEQ ID NO:

36.

4. The method of any one of claims 1-3, wherein the combination comprises isolated bacterial strains that collectively belong to at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, at least 14, at least 15, at least 16, at least 17, at least 18, at least 19, at least 20, at least 21, at least 22, at least 23, at least 24, at least 25, at least 26, at least 27, at least 28, at least 29, at least 30, at least 31, at least 32, at least 33, at least 34, at least 35, or 36 of the bacterial strains of (1)-(36).

5. The method of any one of claims 1-4, wherein the combination comprises each of the isolated bacterial strains of (1)-(36).

6. The method of any one of claims 1-5, wherein substantially all bacteria in the combination are the isolated bacterial strains of (1)-(36).

7. A combination comprising two or more of: an isolated bacterial strain belonging to the genus Coprobacter; an isolated bacterial strain belonging to the genus Phascolarctobacterium; an isolated bacterial strain belonging to the genus Roseburia; an isolated bacterial strain belonging to the genus Dorea; an isolated bacterial strain belonging to the genus Bacteroides; an isolated bacterial strain belonging to the genus Agathobaculum; an isolated bacterial strain belonging to the genus Lawsonibacter; an isolated bacterial strain belonging to the genus Tyzzerella; an isolated bacterial strain belonging to the genus Enorma; an isolated bacterial strain belonging to the genus Faecalimonas; an isolated bacterial strain belonging to the genus Thomasclavelia; an isolated bacterial strain belonging to the genus Clostridium; an isolated bacterial strain belonging to the genus Fournierella; and an isolated bacterial strain belonging to the genus Massilimicrobiota.

8. The combination of claim 7, wherein the combination comprises isolated bacterial strains that collectively belong to at least 2, at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, or 14 of the generaCoprobacter, Phascolarctobacterium, Roseburia, Dorea, Bacteroides, Agathobaculum, Lawsonibacter, Tyzzerella, Enorma, Faecalimonas, Thomasclavelia, Clostridium, Fournierella, and Massilimicrobiota.

9. The combination of claim 7 or 8, wherein the combination comprises one or more of: the isolated bacterial strain belonging to the genus Coprobacter; the isolated bacterial strain belonging to the genus Phascolarctobacterium; and the isolated bacterial strain belonging to the genus Roseburia.

10. The combination of any one of claims 7-9, wherein the combination comprises one or more of: the isolated bacterial strain belonging to the genus Dorea; the isolated bacterial strain belonging to the genus Bacteroides; the isolated bacterial strain belonging to the genus Agathobaculum; the isolated bacterial strain belonging to the genus Lawsonibacter; the isolated bacterial strain belonging to the genus Tyzzerella; and the isolated bacterial strain belonging to the genus Enorma.

11. The combination of any one of claims 7-10, wherein the combination comprises one or more of: the isolated bacterial strain belonging to the genus Faecalimonas; the isolated bacterial strain belonging to the genus Thomasclavelia; the isolated bacterial strain belonging to the genus Clostridium; the isolated bacterial strain belonging to the genus Fournierella; and the isolated bacterial strain belonging to the genus Massilimicrobiota.

12. The combination of any one of claims 7-11, wherein the combination: does not comprise a bacterial strain belonging to the genus Dialister; does not comprise a bacterial strain belonging to the genus Prevotella; does not comprise a bacterial strain belonging to the genus Slackia; does not comprise a bacterial strain belonging to the genus Paraprevotella; does not comprise a bacterial strain belonging to the genus Asaccharobacteria; and / or does not comprise a bacterial strain belonging to the genus Desulfovibrio.

13. The combination of any one of claims 7-12, wherein the combination comprises one or more of: an isolated bacterial strain belonging to the species Atopobium minutum; an isolated bacterial strain belonging to the species Bacillus paralicheniformis; an isolated bacterial strain belonging to the species Bacteroides caccae; an isolated bacterial strain belonging to the species Bacteroides cellulosilyticus; an isolated bacterial strain belonging to the species Bacteroides dorei; an isolated bacterial strain belonging to the species Bacteroides fragilis; an isolated bacterial strain belonging to the species Bacteroides ovatus; an isolated bacterial strain belonging to the species Bacteroides thetaiotaomicron; an isolated bacterial strain belonging to the species Bacteroides uniformis; an isolated bacterial strain belonging to the species Bacteroides xylanisolvens; an isolated bacterial strain belonging to the species Barnesiella intestinihominis; an isolated bacterial strain belonging to the species Bifidobacterium adolescentis; an isolated bacterial strain belonging to the species Bifidobacterium pseudocatenulatum; an isolated bacterial strain belonging to the species Bilophila wadsworthia; an isolated bacterial strain belonging to the species Blautia wexlerae; an isolated bacterial strain belonging to the species Butyricicoccus sp.; an isolated bacterial strain belonging to the species Butyricimonas faecihominis; an isolated bacterial strain belonging to the species Clostridium citroniae; an isolated bacterial strain belonging to the species Clostridium innocuum; an isolated bacterial strain belonging to the species Collinsella sp.; an isolated bacterial strain belonging to the species Coprococcus comes; an isolated bacterial strain belonging to the species Eggerthella lenta; an isolated bacterial strain belonging to the species Escherichia coli; an isolated bacterial strain belonging to the species Eubacterium callanderi; an isolated bacterial strain belonging to the species Faecalibacterium prausnitzii; an isolated bacterial strain belonging to the species Faecalicatena orotica; an isolated bacterial strain belonging to the species Hungatella hathewayi; an isolated bacterial strain belonging to the species Odoribacter splanchnicus; an isolated bacterial strain belonging to the species Parabacteroides distasonis; an isolated bacterial strain belonging to the species Parabacteroides merdae; an isolated bacterial strain belonging to the species Paraclostridium bifermentans;an isolated bacterial strain belonging to the species Peptoniphilus harei; an isolated bacterial strain belonging to the species Ruminococcus sp.; and an isolated bacterial strain belonging to the species Ruminococcus torques.

14. The combination of any one of claims 7-13, wherein the combination comprises isolated bacterial strains that collectively belong to at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, at least 14, at least 15, at least 16, at least 17, at least 18, at least 19, at least 20, at least 21, at least 22, at least 23, at least 24, at least 25, at least 26, at least 27, at least 28, at least 29, at least 30, at least 31, at least 32, at least 33, or 34 of the species Atopobium minutum, Bacillus paralicheniformis, Bacteroides caccae, Bacteroides cellulosilyticus, Bacteroides dorei, Bacteroides fragilis, Bacteroides ovatus, Bacteroides thetaiotaomicron, Bacteroides uniformis, Bacteroides xylanisolvens, Barnesiella intestinihominis, Bifidobacterium adolescentis, Bifidobacterium pseudocatenulatum, Bilophila wadsworthia, Blautia wexlerae, Butyricicoccus sp., Butyricimonas faecihominis, Clostridium citroniae, Clostridium innocuum, Collinsella sp., Coprococcus comes, Eggerthella lenta, Escherichia coli, Eubacterium callanderi, Faecalibacterium prausnitzii, Faecalicatena orotica, Hungatella hathewayi, Odoribacter splanchnicus, Parabacteroides distasonis, Parabacteroides merdae, Paraclostridium bifermentans, Peptoniphilus harei, Ruminococcus sp., and Ruminococcus torques.

15. The combination of any one of claims 7-13, wherein the combination comprises one or more isolated bacterial strains collectively comprising one or more 16S rDNA sequences with at least 97% sequence identity to any one of SEQ ID NOs: 520-614.

16. The combination of any one of claims 7-13, wherein the combination comprises one or more isolated bacterial strains collectively comprising one or more 16S rDNA sequences with at least 99% sequence identity to any one of SEQ ID NOs: 520-614.

17. The combination of any one of claims 7-16, wherein the isolated bacterial strains are lyophilized or spray-dried.

18. A method of treating an inflammatory bowel disease (IBD) in a subject in need thereof by administering to the subject the combination of any one of claims 7-17.

19. The method of claim 18, wherein the combination is administered in a therapeutically effective amount to induce proliferation and / or accumulation of regulatory T cells in an intestine of the subject.

20. The method of any one of claims 1-6 or 18-19, or the combination of any one of claims 7-17, wherein one or more of the isolated bacterial strains produce a short-chain fatty acid (SCFA) selected from the group consisting of acetate, butyrate, and propionate.

21. The method of any one of claims 1-6 or 18-20, or the combination of any one of claims 7-17 or 19-20, wherein the combination is a kit comprising the isolated bacterial strains in one or more dosage forms, each dosage form comprising at least one of the isolated bacterial strains of the combination.

22. The method of any one of claims 1-6 or 18-20, or the combination of any one of claims 7-17 or 19-20, wherein the combination is a pharmaceutical composition comprising one or more dosage forms, each dosage form comprising a pharmaceutically acceptable excipient and at least one of the isolated bacterial strains of the combination.

23. The method of claim 21 or 22, or the combination of claim 21 or 22, wherein each dosage form is in the form of a capsule.

24. The method of any one of claims 21-23, or the combination of any one of claims 21- 23, wherein each dosage form is formulated for oral or rectal delivery.

25. The method of any one of claims 21-24, or the combination of any one of claims 21- 24, wherein each dosage form is formulated for oral delivery.

26. The method of any one of claims 21-25, or the combination of any one of claims 21- 25, wherein each dosage form is formulated for delivery to the colon.

27. The method of any one of claims 21-26, or the combination of any one of claims 21- 26, wherein each dosage form comprises a pH-sensitive composition comprising one or more enteric polymers.

28. The method of any one of claims 1-6 or 18-27, wherein the subject is administered an antibiotic prior to administration of the combination.

29. The method of claim 28, wherein the antibiotic is vancomycin.

30. The method of any one of claims 1-6 or 18-29, wherein the IBD is ulcerative colitis or Crohn’s disease.

31. The method of any one of claims 1-6 or 18-29, wherein the IBD is ulcerative colitis.

32. The method of any one of claims 1-6 or 18-31, wherein the subject is a human.

33. The combination of any one of claims 7-17, wherein the combination is a food product comprising the isolated bacterial strains and a nutrient.

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