104 results about "Marker vaccine" patented technology

The invention provides a porcine pseudorabies virus gene deletion strain, a vaccine composition, and a preparation method and an application of the vaccine composition. The vaccine composition comprises an immunizing dose of an attenuated livetotivirus antigen and an inactivated totivirus antigen of the porcine pseudorabies virus gene deletion strain or its culture. The vaccine composition can effectively induce the antibody production, can effectively protect pigs, and can be used as a marking vaccine to effectively differentiate wild strains and vaccine strains.

The invention discloses a vaccine strain H5N1/PR8-5B19 marked by H5N1 hypotype poultry influenza virus, which also provides the application to prevent and monitor poultry influenza.

The invention discloses an establishing method of a bacterial artificial chromosome recombinant duck plague virus rescue system platform and application of the platform. A bacterial artificial chromosome recombinant duck plague virus is obtained by inserting a recombinant duck plague virus transfer vector pUC18/EGFP-TKAB-BAC11 in a TK domain, wherein the recombinant duck plague virus transfer vector contains a TK gene left-right homologous arm, a reporter gene EGFP and a bacterial artificial chromosome core function component. By means of the platform, the in-vitro biologics characteristics of a UL55 gene-deleted strain established through an inside-bacterium two-step RED recombination method and a back mutation strain and parent strain of the UL55 gene-deleted strain are quite close; the functions are not related to positioning of a UL26.5 gene in a cell. The method is beneficial to development of pathogenic mechanism and gene function research of DPV CHv and is beneficial to the duck plague virus prevention and the research and application of recombinant duck plague virus vaccines of other poultry infectious diseases based on the platform; in addition, due to the fact that the recombinant virus carries a TK deletion mark and an EGFP gene, a mark vaccine can be developed to clinically distinguish a wild virus and a recombinant vaccine virus.

The invention discloses a genotype VII Newcastle disease virus marker vaccine strain and an application thereof, and belongs to the field of genotype VII Newcastle disease virus marker vaccine strain rescue and application. A built Newcastle disease virus reverse genetic operating platform is utilized for enabling NP protein of a G7 strain to miss 18 amino acids and conducting mutation on F-protein cleavage loci, and the highly-weak virulence and high-virus titer genotype VII Newcastle disease virus marker vaccine strain MG7-NPdelta18+Fmut is rescued through screening. The microbial preservation serial number is CCTCC NO: V201505. The marker vaccine strain has the biological characteristics of high growth titer and low virulence in chick embryos and is genetically stable. The immune protection test result shows that the marker vaccine strain is good in immunogenicity, capable of inducing high-level protective antibodies, and capable of completely protecting immunized chicken, can be used for preventing and controlling a currently-popular genotype VII Newcastle disease virus and lays the foundation of identifying vaccine immunity and wild virus infection.

The invention relates to a virus antibody research and provides a method for constructing a hog-cholera virus infectious cDNA carrier having a molecule mark. The method comprises the following steps of: (1) diluting a hog-cholera live vaccine to 1 portion per milliliter as the experimental material, after extracting the head RNA, amplifying 6 corresponding cDNA fragments through RT-PCR section according to designed 6 pairs of primers, (2) leading in the corresponding molecule marks from F1 and F5 of cDNA fragments, (3) reforming plasmids required by overall length cDNA cloning, and (4) constructing the overall length cDNA carrier. A hog-cholera virus lapinized vaccine C stem infectious cDNA carrier pA-FL22 having a molecule mark can be acquired through the method of the invention. The permissive cells of RNA electro transferred hog-cholera virus acquired by the carrier can save the infectious progeny virus which can stably inherit the molecule mark led in the construction. By using the saving technique system of the infectious cDNA carrier and the progeny virus, the copy stem and the pathopoiesia reason of the virus can be deeply researched and the foundation for developing new marked vaccines can be settled.

The invention relates to an application of brucellosis A19 molecular marking vaccine and immunological identification of the brucellosis A19 molecular marking vaccine. The brucellosis vaccine can be applied to an enzyme-linked immunosordent assay (iELISA) method to distinguish an animal inoculated with the vaccine from a wild virus infected animal. According to the invention, a cattle is used as a test target animal antiepidemic to the brucellosis, the cattle is immune to brucellosis A19-detlaVirB12 marking vaccine so as to evaluate the immunological protection of the molecular marking vaccine. An iELISA method for distinguishing the brucellosis A19-detlaVirB12 immune animal from the wild virus infected animal is created. The brucellosis A19-detlaVirB12 marking vaccine provided by the invention not only has good immunological protection against the cattle brucellosis, and the iELISA method provided by the invention solves the problem that the immune animal is difficult to be distinguished from the clinic diseased animal, and the brucellosis A19 molecular marking vaccine has an actual application value in prevention and control, elimination and purification of the cattle brucellosis.

The invention relates to the field of immune marking vaccines and in particular relates to construction and an application of recombinant peste des petits ruminants virus expressing fused exogenous epitope N protein.

The present invention describes a reverse genetic system for Phlebovirus such as Rift Valley fever virus. This system comprised of RNA expression plasmids and protein expression plasmids. Additionally, the present invention also discloses the modification of this system to generate a recombinant virus that expresses a non-viral foreign gene. Furthermore, the present invention discloses the use of this system in the development of anti-Rift Valley fever virus vaccines, screening of antivirals testing for anti RVF immune response and developing marker vaccines for Rift Valley fever virus. We also claim the utility of this approach to other phleboviruses.

The invention relates to a process for generating infectious Newcastle disease virus (NDV) entirely from cloned full-length cDNA and to the use of vaccines and diagnostic assays generated with and derived from the process. The process offers the possibility to modify the NDV genome by means of genetic modification and allows for the introduction of mutations, deletions and/or insertions. The process can be used to modify the virulence of NDV, thus generating new attenuated live vaccines with enhanced properties. The process can be used to modify the antigenic make-up of NDV, to allow the generation of live NDV marker vaccines that can be serologically distinguished from NDV field strains.

Classical swine fever virus is a world-wide distributed highly-contagious disease affecting swine. The two main strategies for diseases control are prophylactic vaccination and non-vaccination stamping out policies. Marker vaccines are a promising strategy. Here we report the rational development of a doubly antigenic marker CSFV experimental live attenuated candidate strain vaccine (Flag/T4 virus). Flag/T virus (Flag/T4v) is based in the combination of two Brescia derived recombinant attenuated viruses: RB-C22 and T4. RB-C22v contains a 19mer insertion in the structural glycoprotein E1, while T4v posses mutated CSFV amino acid residues 830 to 834 in the structural glycoprotein E2, deleting the highly conserved epitope recognized by monoclonal antibody (mAb) WH303. Flag/T4 virus contains a positive foreign antigenic marker, due to the insertion of the highly antigenic epitope Flag in the 19mer insertion of E1, as well as a negative antigenic marker, the lack of reactivity with mAb WH303. Immunized with Flag/T4v induced a complete protection against the challenge with virulent strain Brescia both at 3 and 28 days post infection when nasally administered and since the second day post infection when intramuscularly administered. These results constitute an example of rational design of a CSFV antigenically marked LAV.

The invention relates to a Newcastle disease chimeric virus marker vaccine strain as well as a construction method and application thereof, and belongs to the field of rescue and application of Newcastle disease chimeric vaccine strains. A Newcastle disease virus reverse genetic operation platform is utilized to mutate an F protein cleavage site of a Newcastle disease gene GVII type strain into acleavage site of an attenuated strain, F and HN genes of a mutated gene VII type Newcastle disease strain and NP, P, M and L of a gene II type NDV La Sota strain construct a full-length chimeric cDNAsequence, and a 18bp nucleotide marker sequence is inserted into a non-coding region between P and M. A Newcastle disease chimeric virus NDV DC strain is obtained through transfection cell rescue. Theconstructed chimeric virus can reach relatively high culture titer in chick embryos and cells. The chimeric strain contains envelope surface glycoprotein of the gene VII type Newcastle disease strain, contains a skeleton of the gene II type strain, and has immunogenicity of the Newcastle disease gene VII type strain and high reproduction and high safety characteristics of the gene II type La Sotastrain.

A peptide-based marker vaccine against Porcine Reproductive and Respiratory Syndrome (PRRS) and a set of immunodiagnostic tests for the prevention, monitoring and control of Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) are disclosed. Vaccine formulations according to various embodiments of the invention contain a mixture of peptides derived from PRRSV GP2, GP3, GP4, or GP5 proteins; each peptide individually contains a B cell PRRSV neutralizing/receptor binding epitope which is individually linked to an artificial T helper epitope for enhancement of the respective peptide's immunogenicity; and which can be supplemented with a mixture of peptides representing the T helper epitopes derived from the PRRSV GP4, GP5, M and Nucleocapsid proteins to provide cell mediated immunity. Such viral peptide compositions are prepared in an acceptable delivery system as vaccine formulations and can provide cross protection of PRRSV antibody free pigs from infection upon PRRSV challenge.

The invention relates to a method for establishing a hog cholera lapinized virus labeled vaccine strain and preparing a vaccine. The method comprises the following steps: (1) establishing the overall-length infectious clone of the hog cholera lapinized virus strain (the C strain or the Chinese strain); (2) introducing labeled protein genes; (3) rescuing the hog cholera lapinized labeled vaccine virus; (4) breeding the virus; (5) inspecting a virus solution; (6) preparing a vaccine; and (7) inspecting the finished product of the vaccine, comprising safety inspection and efficacy inspection. The hog cholera lapinized virus labeled vaccine established by the invention maintains the characteristics of good safety, excellent immunogenicity and the like of the hog cholera lapinized virus strain; the virus strain has the advantages of good stability and high cell production virus content, can be used for industrial mass production and can generate a labeled protein specificity antibody aftera hog is immunized to distinguish immunization and natural infection and has important significances on hog cholera prevention, control and purification and emergent immunization.

The invention provides a foot-and-mouth disease marker vaccine strain with 3B protein dominant epitope deficiency and a construction method and application thereof; 3B1 and 3B2 non-structural protein encoded amino acid sequences of the marker vaccine strain are shown as in SEQ ID No. 8. The vaccine strain constructed herein has mutation modifications (4AGP6-4TAA6) of 3B1 and 3B2 non-structural protein amino acids, wherein the mutations of the 3B1 and 3B2 protein amino acids enable a recombinant virus to be completely deprived of the ability to bind with monoclonal antibody 3B4B1 recognizing 3B1and 3B2 dominant epitopes, and the marked virus has the similar replicating ability as parent viruses. Therefore, the foot-and-mouth disease marker vaccine strain constructed herein is suitable for developing foot-and-mouth disease marker vaccines for distinguishing natural infections and vaccine immunity, and reliable technical support is provided for the construction of control, purification and infection-free zones in China.

The invention relates to a marking vaccine for the porcine reproductive and respiratory syndrome high in pathogenicity and a preparation method thereof.A virus seed produced through the vaccine is a constructed JXA1-RM strain, safety and immunogenicity of the JXA1-RM strain are maintained, in addition, the strain is good in stability, and the content of viruses produced by cells is high; after a pig is immunized through the vaccine, no sequence antibody against the M protein linear list position peptide amino acid sequence of the PRRS virus of an American strain is generated, and the vaccine can be used for differentiating an immunized animal from a naturally-infected animal.By means of a method for identifying and diagnosing the strain, antibodies generated by a field strain and a vaccine strain can be diagnosed, a conventional ELISA detection method is combined, an animal immunized through the vaccine and a naturally-infected animal can be differentiated, and it is beneficial to purification of the porcine reproductive and respiratory syndrome high in pathogenicity.

The invention discloses a brucella molecular marker vaccine strain for bovine species and an application thereof. The brucella molecular marker vaccine strain for bovine species, which is provided by the invention, is obtained by replacing the coding gene of a protein bp26 of brucella BH1 with the coding gene of a BLS protein and the coding gene of a protein L7/L12 and inactivating the coding gene of a wboA protein of brucella. Experiments prove that the molecular marker vaccine strain BH1deltabp26deltawboA-BL has good immunoprotection effects on brucellosis, has lower toxicity and obviously improved safety, can be used for immunoprophylaxis of brucellosis of cattle and sheep, can distinguish wild strain infected animals from immune animals by adopting the immunological technique, has great significance in monitoring, diagnosing, purifying and controlling brucellosis and has extensive application value.

Provided is a recombinant H7N9 subtype avian influenza virus, a marked vaccine and a preparation method thereof. For the recombinant H7N9 subtype avian influenza virus, a strain JD/17 of H7N9 subtype avian influenza virus is used as parent virus and a peptide sequence in HA protein of the strain JD/17 is replaced with a peptide sequence in HA protein of H3 subtype; the strain JD/17 of H7N9 subtype avian influenza virus has a preservation number of CCTCC No. V201862. The results of HA titers, EID50, TCID50 show that the rescued virus maintains similar biological characteristics of parent virus, such as high HA titers and EID50, and chickens immunized with the marked inactivated and emulsified vaccine produce a high level of antibody, and this antibody can be distinguished from antibodies produced by chickens naturally infected with H7N9 subtype avian influenza virus.

The present invention provides a process called “Immune Banking” that enhances vaccine efficacy by exploiting existing humoral responses. The process involves tagging new antigens with molecular markers recognized by an existing anti-body response. This recognition of the tagged vaccine components enhances adaptive immune responses to the new vaccine.

The invention discloses a recombinant strain for Brucella melitensis. The recombinant strain for the Brucella melitensis is a bacterial strain obtained by killing encoding genes of cold shock protein in the Brucella melitensis. Compared with an original strain, the obtained strain has virulence lower than that of the prior vaccine M5, and can be used as a vaccine to immunize animals without killing the genes. By utilization of the strain to immunize a mouse, whether a strain separated from the body of a sicken animal is a vaccine strain or a wild strain can be identified by the PCR method. The modification of the brucelliasis vaccine and the research of a diagnosis and identification agent have important significance in developing a brucelliasis gene deletion marker vaccine and a matched diagnosis and identification agent and promoting the elimination and purification of brucelliasis of the animals all over the world.