117 results about "Avian adenovirus" patented technology

The invention aims at providing an I-colony fowl adenovirus 4 strain, which is preserved with preservation number of CCTCC No. V201541. The I-colony fowl adenovirus 4 YBAV-4 strain disclosed by the invention is excellent in specificity and immunogenicity; a specific precipitation line does not appear in specific positive serum chicken SPF chicken serum such as infected cell sap and egg drop syndrome resisting virus, chicken infectious bursal disease virus, Newcastle disease virus, chicken infectious laryngotracheitis virus, chicken Marek's disease virus, avian influenza and the like, while an obvious specific precipitation line appears in I-colony fowl adenovirus 4 specific serum. The strain disclosed by the invention, as a vaccine strain which is good in manufacturing effect, is capable of preventing chicken hydropericardium syndrome, and the strain is applicable to identification of virus serotype and investigation on epidemiology.

The invention discloses a primer pair for preparing a kit for detecting type-4 avian adenovirus and an application thereof. The primer pair comprises an upstream primer and a downstream primer, wherein the nucleotide sequence of the upstream primer is shown by SEQ ID No.1; and the nucleotide sequence of the downstream primer is shown by SEQ ID No.2. The invention also discloses a kit comprising the primer pair and a method for detecting the type-4 avian adenovirus. The primer pair can specifically amplify the Hexon gene segment of the type-4 avian adenovirus in a sample, the detection sensitivity is high, the lowest detection limit reaches 7.2*10<4>ng/mu L, the result is accurate, and the primer pair can be applied to the detection and identification of the type-4 avian adenovirus; the primer pair is universal in detecting different strains of the type-4 avian adenovirus; and the rapid, specific and accurate detection method of the type-4 avian adenovirus provides a detection tool for detecting and controlling the prevalence of the disease.

The invention discloses a newly isolated avian adenovirus 4-type HNJZ strain. The microbial preservation number of the newly isolated avian adenovirus 4-type HNJZ strain is CGMCC NO.13385, and the strain has good specificity and immunogenicity, can serve as an inactivated vaccine production strain and an inspection strain and is used for preventing hepatitis-hydropericardium syndromes of poultry. The invention further discloses a vaccine composition prepared from the avian adenovirus 4 type HNJZ strain. The vaccine composition contains the inactivated avian adenovirus 4-type HNJZ strain and pharmaceutically acceptable adjuvant, the vaccine composition has good immunogenicity, high immunity can be generated after immunization, the protection rate is high, prevalence and spread of avian adenoviruses can be effectively prevented, and application prospects are wide.

The invention discloses a primer pair and a kit for identifying duck adenovirus II type, wherein the nucleotide sequence of the primer pair is represented as the SEQ ID No.1-2. The primer pair is strong in specificity, can accurately and high-effectively identify whether a to-be-test sample contains the duck adenovirus II type or not, while other poultry viruses, comprising poultry adenovirus, parvovirus, Tembusu virus and Newcastle disease virus, cannot be amplified to form DNA fragments. The primer pair is high in sensitivity, can at least detect 0.2258 ng of sample DNA. The primer and the PCR detection kit are short in detection time, wherein the whole PCR process only lasts for about 2 h. The primer pair and the kit are simple and economical, are free of expensive experimental instrument and reagents, can be used for detecting whether ill ducks are infected with the virus or not timely, so that greater economic loss can be avoided by means of corresponding measures.

The invention provides an I-group 4-type aviadenovirus genetic engineering subunit vaccine and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps: cloning an encoding gene of fibrous protein C-terminal from an I-group 4-type aviadenovirus genome according to a PCR technology and performing sequence analysis; cloning the gene to an expression vector pET-32a, transforming escherichia coli, constructing engineering bacteria, and inducing the engineering bacteria by isopropyl-beta-D-thiogalactopyranoside to express the fibrous protein C-terminal; performing lysis on an engineering bacterial cell, performing centrifugal separation on an inclusion body of the engineering bacterial cell, dissolving urea and diluting for renaturation; preparing the vaccine according to the conventional preparation method of a mineral oil adjuvant inactivated vaccine. According to the I-group 4-type aviadenovirus genetic engineering subunit vaccine prepared by the method, the immune effect of the vaccine is evaluated by a serological method and an immunity challenge method, and the result indicates that the aviadenovirus inactivated vaccine prepared by the method can provide effective immunoprotection and has a good commercialized development prospect.

A high level replication fowl adenovirus (FAdV) isolate capable of reaching a viral titer of at least 3 log 10 is described. Said FAdV is a non-pathogenic strain of fowl adenovirus serotype 4, identified as FAdV-4 ON1. Additionally, the present disclosure also provides a viral vector comprising the fowl adenovirus, which has inserted an exogenous nucleotide sequence coding for at least one antigenic site of a disease of concern, as well as a method for obtaining said viral vector and an immunogenic composition comprising the same.

The invention discloses a group I type 4 aviadenovirus strain WZ. The strain has a preservation number of China Center for Type Culture Collection (CCTCC) No: V201662, is named as group I type 4 aviadenovirus strain WZ in a classified way, and is preserved in December 14, 2016; a group I type 4 viral vaccine of the aviadenovirus is prepared from the inactivated group I type 4 aviadenovirus strain which is taken as an active ingredient; the invention also provides application of the group I type 4 aviadenovirus strain WZ in preparation of an agar gel precipitating antigen, a hemagglutination inhibition (HI) antigen and positive serum antigen reagent which are used for diagnosing the group I type 4 virus of the aviadenovirus, and preparation of egg yolk antibody and antiserum which are used for treating the group I type 4 virus of the aviadenovirus. After the vaccine prepared by using the group I type 4 aviadenovirus strain is used for immunizing, the toxin attacking protection rate for the group I type 4 aviadenovirus strain WZ reaches 90-100%. As a vaccine strain with good manufacturing effect, the group I type 4 aviadenovirus strain WZ can be used for preventing avian inclusion body hepatitis and pericardial effusion syndrome, and also can be used for virus identification and epidemiological investigation.

The invention relates to recombinant newcastle disease vaccine candidate rAI4-penton to express avian adenovirus penton protein and a construction method thereof. newcastle viral strain rAI4-penton iscollected under CGMCC No: 15492. The construction method includes: using a reconstructed reverse genetics operating platform of a newcastle attenuated strain to penton gene sequence of avian adenovirus into genome full-length transcription vector pNDV/rAI4 of the strain AI4 so as to obtain recombinant newcastle viral genome full-length cDNA clone pNDV/rAI4-penton, and performing transfecting to obtain recombinant viral rAI4-penton that successfully express penton protein. The recombinant virus rAI4-penton has high breeding titer on chicken embryos, can stabilize the penton protein even aftercontinuous passage, is suitable for large-scale production of vaccines, and is suitable for making vaccines.

The invention relates to the field of the preparation of yolk antibodies from avian eggs, and discloses an extraction method of a yolk antibody of aviadenovirus IV. The extraction method comprises the following steps of (1) using an oil-emulsion inactivated vaccine of the aviadenovirus IV as an antigen to immunize a health hen, and collecting an egg laid by the immunized hen; (2) separating yolk in the egg laid by the immunized hen to obtain water-soluble component liquor; (3) adding the water-soluble component liquor obtained by separating the yolk into an aqueous two-phase system, so as to obtain water-soluble component mixed liquor, wherein the aqueous two-phase system is prepared from 25wt% to 28wt% of polyethylene glycol and 20wt% to 25wt% of sodium citrate; (4) carrying out separation and purification on the water-soluble component mixed liquor. The invention provides the extraction method of the yolk antibody of the aviadenovirus IV, which is high in antibody purity and high in yield and does not influence activity.

The invention discloses an ELISA (enzyme-linked immunosorbent assay) detection method for identifying fowl adenovirus group I (FAVI) infection. The method is characterized by taking an FAVI 100K recombinant protein as the envelop antigen, chicken serum as the detection sample and horse radish peroxidase labeled goat anti-chicken IgG as the enzyme-labeled antibody to detect the antibody generated through FAVI infection. The method is strong in specificity, short in time and low in cost, is simple to operate, can be used for mass detection, can effectively get rid of interference of immunity of FAVI inactivated vaccines and can specifically detect FAVI infection, thus distinguishing FAVI infected animals from FAVI inactivated vaccine inoculated animals and providing a diagnostic tool with actual value for eliminating FAVI in China.

The invention relates to a preparation method of a newcastle disease, avian influenza virus and avian adenovirus trivalent inactivated vaccine. The method comprises the following steps: (1) inoculating an avian adenovirus type 4 virus into an LMH cell and obtaining a vaccine-made virus liquid through the steps of culture, freeze thawing, centrifugation and concentration; (2) inoculating a newcastle disease virus La Sota strain and an H9 subtype avian influenza virus into a chick embryo allantoic cavity separately, culturing to obtain a chick embryo allantoic liquid and carrying out centrifugation and concentration to obtain a newcastle disease and H9 subtype avian influenza virus vaccine-made virus liquid; and (3) inactivating virus liquids of the three viruses, and carrying out isopyknic mixing and emulsification to obtain an emulsion-type inactivated vaccine. The trivalent inactivated vaccine provided by the invention has a complete immune protecting effect on the newcastle disease virus, the H9 subtype avian influenza virus and the avian adenovirus type 4 virus, and is good in security, stable, effective and long in protection period.

The invention belongs to the technical field of vaccine preparation, and in particular, relates to a serum type 4 fowl adenovirus inactivated vaccine and a preparation method thereof. The serum type 4 fowl adenovirus inactivated vaccine has an antigen which is an inactivated serum type 4 fowl adenovirus having the titer not less than 109 TCID50/ml and obtained by a suspension culture method. With use of chicken liver cells, the serum type 4 fowl adenovirus is efficiently amplified by a riptide-type bioreactor suspension culture technology, and the high-titer serum type 4 fowl adenovirus inactivated vaccine is developed. The titer of the vaccine is 109 TCID50/ml and is 100 times that of a traditional chick embryo vaccine. The preparation of the high-titer serum type 4 fowl adenovirus inactivated vaccine can greatly reduce the cost of the vaccine, provides the immune effect of the vaccine, and has a good prospect of application.

The invention provides an avian adenovirus fiber protein subunit vaccine. A new-type antigen fiber protein of an avian adenovirus is used, after a sequence is optimized, the fiber protein acquires soluble expression in escherichia coli, and an expression product is used for preparing the subunit vaccine, wherein an amino acid sequence of the avian adenovirus fiber antigen protein is SEQ ID NO: 4,and a nucleotide sequence of an encoding gene thereof is SEQ ID NO: 3. The subunit vaccine prepared by the avian adenovirus fiber protein has the characteristics of high antigen stability, high purity, strong specificity, no generation of other uncorrelated antibodies, and convenient and accurate detection method. A firm foundation is established for industrially producing the avian adenovirus subunit vaccine and diagnostic reagent.

The invention provides a fowl adenovirus strain, an inactivated vaccine and a preparation method. The fowl adenovirus strain is named a fowl adenovirus TJ strain with a preservation number of CCTCC (China Center For Type Culture Collection) NO:V201632; the adenovirus strain is of race C in a fowl adenovirus I subgroup, the serotype is 4 type, viral nucleic acid is double stranded DNA (Deoxyribonucleic Acid), and no envelope is found; the diameter of virus particles is 70 to 90nm, and the virus particles are of icosahedral symmetrical structures; the inactivated vaccine is prepared by performing cell inoculation, venom harvesting, inactivating and emulsifying on a fowl adenovirus; a vaccine strain is a prevalent strain, and is good in immunogenicity and high in multiplication capacity; the prepared vaccine has the advantages of high safety, good stability, quick production of immune response, high virus challenge protecting rate, and the like.

The invention belongs to the technical field of biology, and discloses group I type 4 avian adenovirus subunit protein with an immunoprotection function. The subunit protein is group I type 4 avian adenovirus short fiber mutation protein spherical region truncated protein; the antigen from amino acid 283 site to amino acid 479 site determines the cluster amino acid sequence; better antigenicity and immunogenicity are realized. The group I type 4 avian adenovirus subunit protein and pharmaceutically acceptable adjuvant is prepared into vaccine; a preparation method of the vaccine mainly comprises the steps that firstly, the group I type 4 avian adenovirus short fiber mutation protein spherical region truncated protein nucleotide sequence subjected to codon optimization is cloned into the carrier; then, a recombinant vector is subjected to conversion, inducible expression and purification to obtain antigen protein; finally, the antigen protein and the adjuvant are emulsified to obtain the vaccine. The vaccine is safe and effective; the method for preparing the subunit vaccine is simple; the cost is low; the amplification is easy.

The invention relates to the technical field of veterinary biological products, in particular to a group I avian adenovirus type 4 strain and application thereof. The group I avian adenovirus type 4 strain ZMXZAV-4 strain, with an accession number of CGMCC No. 14296, has the characteristics of strong cellular adaptability, high toxin production and strong immunogenicity. Newcastle disease virus (NDV), infectious bursal disease virus (IBDV) and avian adenovirus (AAV) are triple inactivated vaccines based on the virus strain, wherein the NDV is La Sota strain, the infectious bursal disease virus(IBDV) strain is LY23 with an accession number of CGMCC No. 11594; the Avian adenovirus is group I avian adenovirus type 4 ZMXZAV-4 strain, with an accession number of CGMCC No. 14296. The vaccine issafe and effective, and can be used for preventing Newcastle disease, infectious bursal disease and avian adenoviral disease, achieving the effect of preventing three diseases by one injection, and reducing immune cost and immune stress reaction.

The invention belongs to the technical field of veterinary biological products and particularly relates to a preparation method of avian influenza virus subtype H9 and fowl adenovirus 4 combined inactivated vaccine. LHM (Leghorn male hepatocarcinoma) continuous cell line is used as carrier cells to perform viral multiplication, culture medium A composed of glutamine, recombinant human insulin, human serum albumin, transferrin, biotin and growth factors is used to perform culturing, and a viral liquid is collected and inactivated to prepare the vaccine. The multiplication of avian influenza virus subtype H9 and fowl adenovirus 4 by the LHM continuous cell line has no need for additional pancreatin, the background of LHM cells is clear, no extraneous pathogens occur, the multiplication is easy, the process can be effectively simplified, and the cost can be reduced; in addition, the avian influenza virus and fowl adenovirus combined inactivated vaccine has high viral content, good stability and high safety and is an ideal avian influenza virus and fowl adenovirus combined inactivated vaccine.

The invention provides a newcastle disease virus, avian influenza virus and avian adenovirus triple inactivated vaccine. TCID50 of I-group 4-type avian adenovirus YBAV-4 new strains is high in tilter, good in immunogenicity and capable of resisting attack of isolated viruses of H9 sub-type and avian adenovirus diseases in various places. The prepared vaccine is good in safety, and no local or whole-body adverse effects caused by the vaccine occur. By means of analysis of character, safety test and potency test data in a preservation state test, compared with results of single vaccines of similar products, difference of the triple vaccine is not remarkable, and the triple vaccine is stable and effective; a potency test result proves that the triple vaccine and three kinds of single-vaccine antibodies are all kept at a high level, antibody generation is faster compared with similar products, and the antibody of a control group is negative.

The invention discloses an egg yolk antibody of inclusion body hepatitis (IBH) and a preparation method thereof. The egg yolk antibody comprises an IBH virus strain. The virus is avian adenovirus group-I serum 4-type virus and is called SDJ15-8, and is preserved at China Center for Type Culture Collection, Wuhan University, and is assigned the accession number CCTCC No.V201636. The preparation method comprises the steps of: 1) preparing an inactivated vaccine from the IBH virus strain SDJ15-8; 2) performing injection immunization to laying hens with the inactivated vaccine to produce high-immunized eggs; and 3) collecting yolks from the high-immunized eggs, and performing extraction and inactivation in an acidified water-octanoic acid manner to prepare the IBH egg yolk antibody. The egg yolk antibody can effectively prevent and treat the IBH and is more than 82% in curative rate.

The present invention relates to a nucleic acid sequence encoding a fragment of the adenovirus fiber capsid protein, particularly, of the avian adenoviruses HEV or EDS. This sequence comprises the C-terminal knob and part of the shaft domain of the fiber protein of these adenoviruses. The invention further provides for DNA constructs comprising said DNA fragment and recombinant proteins encoded thereby. The recombinant proteins of the invention elicit in an animal, preferably in a domestic bird, protective immunity against a specific viral pathogen. The invention further relates to the use of these recombinant proteins as an active ingredient in vaccinating compositions for conferring to an animal immunity against a pathogenic infection by an adenovirus, and to methods for vaccinating a domestic bird against a pathogenic adenoviral infection.

The invention discloses a group I serum type 4-serum type 8 avian adenovirus bivalent subunit vaccine and a preparation method thereof. The vaccine comprises type-4 avian adenovirus fibrin with an amino acid sequence as shown in SEQ ID NO.1 and type-8 avian adenovirus fibrin with an amino acid sequence as shown in SEQ ID NO.2. The method adopts the full-length fibrin of avian adenovirus serum type4 and serum type 8 as an immunogen to prepare the bivalent subunit vaccine, and after optimization by a specific codon optimization mode, the expression quantity and the soluble expression quantity of serum type 4-serum type 8 fibrinare obviously improved. The bivalent subunit vaccine provided by the invention has higher safety, can quickly induce immune animals to generate high-level neutralizing antibodies, and realizes high-efficiency immune protection of avian adenovirus serum type 4 and serum type 8. Besides, the vaccine is simple in preparation process, low in cost and easy for large-scale production.

The invention provides a novel avian adenovirus, a quadruple vaccine and a preparation method thereof. The novel avian adenovirus is avian adenovirus group I serum type 4 DC strain, which was preserved in General Microbiology Center of China Microbe Preservation Management Committee on April 25, 2018 and was assigned the accession number CGMCC No. 15589; the quadruple vaccine is a quadruple vaccine against Newcastle disease, avian influenza, infectious bursal disease and group I type 4 aviadenovirus DC strain. The quadruple vaccine has good immunogenicity, the antibody production is quick after immunity, the generated antibody titer is high, the maintenance time is long, the immunizing dose is small, a selected adjuvant is easy to inject, and four diseases can be prevented and controlled with one needle. The vaccine has the advantages of being efficient and good in safety.

The invention relates to a construction method of recombinant baculovirus for expressing serum type 4 avian adenovirus fibroid protein F2. The construction method comprises the following steps: (1) constructing an FAdV4F2 gene recombinant baculovirus expression vector; (2) packaging and passing baculovirus for expressing recombinant FAdV4 protein; and (3) transfecting baculovirus genome carrying FAdV4F2 gene into Sf9 cells, culturing in an incubator at 27 DEG C for 57 days, and observing cytopathic effect; when cytopathic effect reaches 70%, collecting cell lysis buffer, centrifuging to removeprecipitate, and preserving as seed virus; passing virus, and carrying out enlarged culture as seed virus when passing to the third generation. According to the invention, a baculovirus expression system is utilized to construct a recombinant baculovirus shuttle vector containing F2 gene, the recombinant baculovirus shuttle vector is transfected into Sf9 cells to obtain recombinant baculovirus rBAF2, and expression of recombinant protein F2 is identified by virtue of indirect immunofluorescence assay (IFA) and Western blot.

The invention discloses an avian adenovirus transfer carrier. PUC18 is regarded as a skeleton plasmid; left and right flanking sequences of an FAVI-AV208 strain genome unnecessary region are inserted in the PUC18 carrier for homologous recombination, but a replicative unessential region of 2980 bp between the left and right flanking sequences is deficient; and a gene expression box including polyA signals of hCMV, MCS, eGFP and SV40 early transcription is inserted between the left and right flanking sequences. The invention also provides a preparation method of the avian adenovirus transfer carrier; and a recombinant virus is also prepared successfully. By introducing a complete foreign gene expression box for one step and adding suitable digestion positions, a carrier construction method is improved, workload is extremely reduced, the replicative unessential region is deleted to a relatively great extent and greater fragmental foreign genes can be contained.

The invention discloses an indirect ELISA (Enzyme-linked Immuno Sorbent Assay) kit for detecting a blood serum 8 type avian adenovirus antibody based on spike glycoprotein F. The indirect ELISA kit comprises an ELISA enzyme-linked plate which is coated with expression protein of blood serum 8 type avian adenovirus spike glycoprotein gene F, positive and negative controls, an HRP (Horseradish Peroxidase) labeled rabbit anti-chicken secondary antibody, a diluting solution, a color developing solution, a washing solution and a stopping solution. The ELISA kit disclosed by the invention can be used for specifically detecting a FAdV-8 antibody and does not react with anti-influenza virus blood serum, anti-Marek's virus blood serum, anti-Newcastle disease virus blood serum, anti-chicken infectious anemia virus blood serum, reticuloendotheliosis virus, ant-blood serum 4 type avian adenovirus blood serum, anti-egg drop syndrome virus blood serum and SFP chicken blood serum. Therefore, the kitdisclosed by the invention has good FAdV-8 specificity and can be used for FAdV-8 infection and immunization status epidemiological surveys.