44 results about "Rabies virus strain" patented technology

The present invention discloses a construction of three-gene defected recombinant pseudorabies virus (PrV) strain, vaccine prepared by said strain, method for constructing said strain and method for preparing said vaccine. The described recombinant pseudorabies virus strain defects genes of TK.gE ang gI, and contains no exogenous gene. The described vacine belongs to the freeze-dried live vaccine made up by virus liquid containing said invention and gelatin. Said invented live vaccine can be inoculated on the piglet, slaughter pig and sow with farrow, and can obtain obious immune effect. Said vaccine has good biological safety, and can be used for preventing and curing pseudorabies.

The invention relates to the field of biotechnology, in particular to a virus seed for producing vaccines for preventing human rabies by utilizing human diploid cells (KMB17) and a preparation method thereof. In the invention, a rabies fixed virus CTN-1V5 strain is continuously subcultured in the human diploid cells (KMB17), and a terminal dilution method is used for screening viruses with highertiter, thereby obtaining a rabies virus strain which is suitable for the human diploid cells (KMB17) and has good immunogenicity and heredity stability, and culturing a rabies vaccine virus seed (CTN-DK strain) capable of efficiently reproducing in the human diploid cells (KMB17). By using the virus seed for producing a human diploid cell (KMB17) rabies vaccine, the risk caused by residual heterogonous DNA (deoxyribonucleic acid) in the vaccine which is currently used at home can be effectively avoided, and the safety and practicability of the rabies vaccine in China are further improved, thus the invention has great social and economic benefits.

Rabies Virus compositions and methods are provided. The full-length sequence of Rabies Virus strain Evelyn-Rokitnicki-Abelseth (ERA) is disclosed. A reverse genetics system for producing recombinant ERA virus and derivatives thereof is provided, along with compositions including ERA and/or ERA derivative strain viruses, nucleic acids and/or proteins. In some instances, the compositions are immunogenic compositions useful for the pre- or post-exposure treatment of Rabies Virus.

The invention belongs to the field of biological products, in particular to a process for preparing rabies vaccine by culturing human diploid cells WI-38 and MRC-5 (called as human diploid cells as follows) as toxigenic cells through a Celligen310 bioreactor and taking a rabies virus PM strain as a virus seed, wherein the finished vaccine is prepared by comprising the steps of resuscitating human diploid cells, culturing and proliferating the human diploid cells, inoculating the virus seed of the rabies virus PM strain onto the human diploid cells, domesticating, inoculating and culturing virus seeds, collecting virus filtrate, inactivating, purifying, concentrating, adding a protective solution and the like. Verification indexes of the vaccine meet standards of Chinese Pharmacopoeia of 2010 version. The process is characterized in that the human diploid cells are cultured and prepared as matrix cells by using the Celligen310 bioreactor; therefore, exogenous pollution factors and tumorigenicity of animal passage cells can be avoided. As the inoculated virus strain is the rabies virus PM strain in the preparation process of the vaccine, the immune effect is better than that of the traditional vaccine. The vaccine prepared by using the process has the advantages of being high in purity, good in immune effect and high in safety.

The invention discloses a rabies live vaccine and a method for preparing the rabies live vaccine for oral administration. The rabies live vaccine comprises a rabies virus ERAg3m. A strain of the rabies virus ERAg3m is obtained by using a reverse genetic method for transforming a rabies virus strain ERA and has high safety. Therefore, the immune efficacy of the rabies live vaccine containing the rabies ERAg3m virus can be further improved.

The present invention relates to recombinant raccoon poxvirus vectors that express the rabies virus glycoprotein gene at the hemagglutinin (ha) locus of the poxvirus genome or express the glycoprotein gene of the same or different rabies strains at the thymidine kinase (tk) and the hemagglutinin (ha) loci of the poxvirus genome, and their use as adjuvant-free vaccines. The raccoon poxvirus vector comprises the nucleic acid molecules encoding the glycoprotein of a Challenge Virus Standard rabies strain inserted and expressed at the tk locus of the poxvirus genome and of a Pasteur-Paris rabies strain inserted and expressed at the ha locus of the poxvirus genome. The vaccine may optionally contain a mixture of additional feline and canine antigens for immunization of animals. Also disclosed are methods for inducing an immune response to rabies in a mammal by administering to the mammal an effective immunizing amount of the vaccine of the invention.

The invention discloses a recombinant rabies virus carrying a deoptimized M gene and two G genes. Firstly, a reading frame part of the M gene is deoptimized, wherein the sequence after deoptimization is as shown in SEQ ID NO.2; secondly, a rabies virus HEP-Flury strain is taken as a skeleton, an M gene in the HEP-Flury is replaced by the deoptimized M gene, and an additional rabies virus G gene is inserted to obtain recombinant rabies virus pHEP-dG-Mmin plasmid carrying the deoptimized M gene and two G genes; finally, rescuing and screening are conducted to obtain a recombinant rabies virus strain rHEP-dG-Mmin. The recombinant virus has higher virus titer, and the cost of canine vaccine can be reduced. Under the condition of multiplicity of infection, G protein with higher level can be expressed, virus replication and transcription of each structural gene are increased, and the recombinant virus has the potential of serving as a rabies vaccine candidate strain.

The invention provides a recombinant rabies virus strain with a G gene additionally inserted in a genome, a method for constructing the recombinant rabies virus strain and application thereof. The recombinant rabies virus strain constructed by the method has high safety and immunogenicity, and is suitable for preparing vaccines for inactivating rabies virus.

The invention provides a pseudorabies virus JS-2012 infectious clone plasmid and a construction method and application; the JS-2012 infectious clone plasmid is constructed on the basis of newly appeared PRV variant JS-2012 in China by insertion of a pBeloBAC11 vector sequence in the downstream of gG gene termination codon of JS-2012 by use of a loxP-Cre enzyme system, a galK positive and negative screening system is used for genetic sequence operation of the JS-2012 infectious clone plasmid to establish a variant JS-2012 reverse genetic operating system, and a technical platform is provided for deep research of PRV variant genetic variation mechanisms, virulence enhancement and virus latent infection mechanisms, vaccine development and the like.

The invention discloses a herpesviridae strain which is characterized in that a preservation number of the herpesviridae strain is CCTCC (China Center For Type Culture Collection) NO:V201314; a PRV/HN2012 strain is inherited to the seventh generation, the seventh-generation virus is subjected to determination of a virus titer TCID50 (Tissue Culture Infectious Dose), and final result shows that the TCID50 is 10<9.0>; the PRV/HN2012 strain is inoculated to mice, and after the inoculated virus is challenged for 24h, the mice in a PRV/HN2012 strain infected group are found with neurologic symptoms; after the inoculated virus is challenged for 48h, all the mice are found to die, experimental results show that the strain has high toxicity; based on the results, the research of physicochemical properties of the PRV/HN2012 strain indicates that the strain is sensitive to analytically-pure chloroform and belongs to a virus with an envelope; with higher resistance to acid and alkali, the strain can be deactivated after being treated with hydrochloric acid with the pH value of 3.0 and NaOH with the pH value of 11.0; with higher resistance to heat, the strain can be deactivated after being treated in a water bath with 56DEG C for 1h; the strain is sensitive to trypsin, so that the influence of ultraviolet rays on the infectivity of the strain is not obvious after the strain is treated by the ultraviolet rays for 30min.

The invention provides a recombinant rabies virus strain. A nucleotide sequence as shown in SEQ ID NO.1 is formed by inserting two rabies virus G genes into a rabies virus genome which is obtained by reverse genetic operation of a whole genome sequence of a SAD Bern rabies virus. The constructed recombinant rabies virus has better security and immunogenicity and is suitable for preparing an inactivated rabies vaccine.

The invention discloses a pseudorabies virus gene deleted strain, and a preparation method of an inactivated vaccine for porcine pseudorabies. The gene deleted strain is a pseudorabies virus gE gene deleted strain, which is constructed through reading frame frameshift mutation caused by deletion of a plurality of basic groups from a wild-type pseudorabies virus (PRV) strain gE gene sequence. The preparation method includes the following steps: constructing the pseudorabies virus gE gene deleted strain; domesticating a porcine testicular cell and subjecting the same to suspension culture; inoculating the porcine testicular cell with the pseudorabies virus gE gene deleted strain, and harvesting a cell culture when 80-90% of the cell has lesions to obtain cell venom containing supernatant; taking the supernatant to measure the valence, and inactivating the qualified cell venom in a sterilization container; and mixing the inactivated cell venom with an adjuvant to obtain the inactivated vaccine for the porcine pseudorabies. The prepared inactivated vaccine for the porcine pseudorabies has high immunogenicity, long immunization period, and no side effects after immunization, is safe andreliable, and can effectively prevent infections of pseudorabies virus epidemic strains.

The invention discloses recombinant rabies viruses BNSP-CDV-F and BNSP-CDV-H in which canine distemper virus main immune genes are embedded. The recombinant viruses take a rabies virus strain SAD-B19as a framework, CDV-F and CDV-H genes shown in SEQ ID NO.1 and SEQ ID NO.2 are separately inserted between an N gene and P gene of a recombinant plasmid SAD-19 full-length cDNA, and finally recombinant rabies virus strains BNSP-CDV-F and BNSP-CDV-H are saved through a reverse genetic operation technology. The recombinant viruses BNSP-CDV-F and BNSP-CDV-H can express fusion protein and hemagglutinin protein of canine distemper viruses; after a vaccine prepared by mixing the recombinant viruses is used for immunizing animals, a great number of anti-rabies virus antibodies and main immune gene antibodies resistant to the canine distemper viruses can be induced and generated. The cost of the vaccine can also be reduced, and the recombinant viruses BNSP-CDV-F and BNSP-CDV-H have a good application and popularization prospect.

The invention discloses a construction method of PRV gE/gI dual-gene deletion strains for expressing ASFV P30 protein and belongs to the biopharmaceutical field. The construction method specially comprises the following steps of S1, preparing a reagent; S2, preparing cloned plasmids; S3, constructing a PRV eukaryon transfer plasmid pEGFP-CP204L; S4, performing cotransfection on DNA of PRV and pEGFP-CP204L plasmids. P30 protein gene (CP204L) fragments are synthesized, the transfer plasmid pEGFP-CP204L is constructed, a classical homologous recombination manner is adopted for inserting an ASFV CP204L gene into a PRV genome to replace gI and gE virulence genes, and recombinant pseudorabies virus strains rXJgE/gI-CP204L for constructing co-expression P30 protein can be used for preventing ASFVand PRV infection, and the cloned plasmids are simple to prepare, low in cost and suitable for industrial production.

The invention provides a recombinant rabies virus of a chimeric canine parvovirus VP2 gene, and belongs to the technical field of immunology. The recombinant rabies virus takes a rabies vaccine candidate strain SAD-B19 as a skeleton, and the VP2 gene of a CPV-2a strain currently popular in China is inserted into an SAD-B19 genome; the recombinant rabies virus strain of the chimeric VP2 protein is obtained through rescue, after immunization, high-level anti-rabies virus antibodies and anti-canine parvovirus VP2 antibodies can be induced to be generated, and the vaccine is low in cost, safe and effective.

The invention relates to the technical field of biological medicines, in particular to a rabies vaccine virus screening method and a preparation method of a rabies vaccine. The screening method comprises the step that rabies virus strains are culture in the way that ultrahigh MOI and ultralow MOI are alternatively circulated. Viruses can quickly adapt to cells for six or eight passages, the virustiter is raised to 7.51 gFFU/ml from 4.61 gFFU/ml, the passage adaptation cycle of the virus strains is obviously shortened, the virus yield and the vaccine production efficiency are greatly improved,and the preparation method is suitable for scale production of the rabies vaccine.

The invention provides a VP2 fusion gene, a recombinant rabies virus rHEP-rVP2 strain and a construction method and application of the strain, and belongs to the field of microbial immunology. The sequence of the VP2 fusion gene is as shown in SEQ ID NO:1. The recombinant rabies virus rHEP-rVP2 strain is obtained by inserting the VP2 fusion gene between a G gene and an L gene of a genome of a HEP-Flury strain. The construction method of the recombinant rabies virus strain rHEP-rVP2 includes the steps that the VP2 fusion gene is inserted in full-length cDNA of the HEP-Flury strain to construct recombinant plasmids, a host cell is subjected to transfection, a virus is rescued, and the rHEP-rVP2 strain is obtained. The recombinant rabies virus rHEP-rVP2 strain has virus titer similar to that of a parent strain, has good immunogenicity, can generate a high-level antibody for the rabies virus and the canine parvovirus after immunizing, and can serve as a bivalent vaccine candidate strain.

The invention discloses a reverse cross-multistage nerve tracing method, which comprises the following steps of: constructing a transgenic animal capable of expressing G protein of rabies virus, infecting the transgenic animal by using a defective rabies virus strain losing the G protein, and providing the G protein for the defective rabies virus strain losing the G protein by using the infected cells of the transgenic animal. The infection transmission activity is recovered, and the purpose of reverse cross-multistage nerve tracing is achieved. The method is more excellent in neuron marking efficiency and effect, and compared with PRV neurons, the neuron toxicity is smaller, the genome length is shorter, and primate animals can be infected, so that subsequent research on neuron morphology, namely functions, is more facilitated, and the requirements of subsequent brain connection group research are better met.