242 results about "Swine Fever Virus" patented technology

The invention discloses a rapid fluorescence PCR detection kit for ASFV (African swine fever virus). The kit comprises specific primers ASFV-F and ASFV-R as well as a TaqMan probe ASFV-P, the 5' end of the probe labels fluorescence dye as FAM and the 3' end labels a fluorescence quenching group as BHQ-1. The kit can be used for detecting the ASFV in nasal swabs, blood, serum, plasma and tissue ofswine to realize rapid detection of the ASFV. In the whole ASFV detection process, only 40 min is taken from DNA extraction to obtaining of detection results, so that the detection time is greatly shortened, and the detection efficiency is improved.

The invention discloses a Cpf1 reagent kit for quickly detecting nucleic acid of an African swine fever virus. The Cpf1 reagent kit comprises a Cpf1 detection system suitable for quickly detecting theAfrican swine fever virus, and an immune colloidal gold test strip, wherein the Cpf1 detection system comprises specific crRNA protein, specific Cpf1 protein and a single-chain DNA(ssDNA) reporting system in accordance with a p72 gene of the African swine fever virus, the specific crRNA is one or more of crRNAs from ASFV P72 crRNA1 to ASFV P72 crRNA10, and the sequence of the specific crRNA is SEQ NO.4 to SEQ NO.13; and the single-chain DNA(ssDNA) reporting system comprises ssDNA FQreporter for fluorescence detection of a microplate reader and/or ssDNA DB reporter for detecting the immune colloidal gold test strip. According to the Cpf1 reagent kit disclosed by the invention, for the first time, the Cpf1 is used for detecting the African swine fever virus, and has the advantages of beinghigh in sensitivity, high in specificity, short in time consumption, high in flux, independent of large-scale experiment equipment and the like. The advantages enable a detection method based on the immune colloidal gold test strip developed by the invention to be conveniently used in basic laboratories and breeding enterprises to be used for performing detection, identification and diagnosis on basic quick detection of the African swine fever.

The invention discloses a method for detecting the specific antibody of classical swine fever virus and a special ELISA kit thereof. The kit includes a classical swine fever virus antigen and an enzyme-labeled classical swine fever virus single-epitope specific antibody; the said swine fever virus antigen is a polypeptide containing one or more than one amino acid residue sequence described in sequence 1. The detection reagent of the classical swine fever virus specific antibody of the present invention can carry out effective detection to the classical swine fever virus specific antibody by solid-phase antigen competition ELISA (blocking method); The B cell epitope ensures the differential diagnosis, and the high degree of conservation of the epitope among various strains ensures the specificity of detection.

The invention provides an amphimorphic FQ-PCR detection reagent kit for identifying African swine fever and swine fever virus wild strains. A P72 gene of ASFV and a 5'UTR noncoding region of CSFV arerespectively used as an amplification target area, a pair of specific primers and a TaqMan MGB probe (SEQ ID NO:1-6) are designed, a real-time fluorescent quantitation PCR(FQ-PCR) technique is used, and identification and detection of ASFV and CSFV are realized. The detection reagent kit provided by the invention is suitable for detecting viral nucleic acid in samples of serum, spleen, lymph nodes, tonsil, kidney and the like of suspected ASFV or CSFV infected pigs, the sensitivity can reach 1.0*10<1>copy/[mu]L, and the detection reagent kit does not have any cross reactions with other pathogens which are liable to be in mixed infection with the ASFV and the CSFV or of which the infection symptoms are similar such as PRRSV, PRV, PCV2, PPV, JEV and HPS.

The invention discloses a swine fever vaccine heat-resistant freeze-drying protective agent, and a preparation method and an application thereof. The heat-resistant freeze-drying protective agent comprises the following components: trehalose, polyvinylpyrrolidone (PVP), gelatin, sodium glutamate, D-sorbic alcohol, polypeptone, L-arginine, vitamin C and water for injection and is prepared by dissolving and degerming. The heat-resistant freeze-drying protective agent is mixed with swine fever virus antigen liquid according to the volume ratio of 1:(08-1.2) and is frozen and dried after being packaged to obtain swine fever vaccine. The prepared heat-resistant freeze-drying protective agent is simple in formula, is easy to prepare, is suitable for large-scale production and has good protection efficacy on the vaccine. The prepared vaccine has the characteristics of safety and sterility, stable quality, heat resistance and long saving time. The swine fever vaccine heat-resistant freeze-drying protective agent solves the problems that the vaccine is required to be frozen at a low temperature, is not convenient to store and the like in the transportation process. Through the swine fever vaccine heat-resistant freeze-drying protective agent, the swine fever vaccine can be saved for above 30 months at a temperature of 2-8 DEG C.

The invention discloses an indirect ELISA kit for detecting an African swine fever virus antibody and an application thereof, and belongs to the technical field of biology. The kit adopts prokaryotic expression recombinant P30 protein as a coating antigen, and detects the antibody of African swine fever virus in porcine serum based on the indirect ELISA principle. The coating antigen in a 96-well plate of the kit is prokaryotic expression recombinant P30 protein which has good antigenicity. The enzyme-linked immunoassay kit provided by the invention comprises a 96-well plate coated with P30 protein, a positive control, a negative control, a horseradish peroxidase-labeled rabbit anti-porcine IgG polyclonal antibody, a concentrated washing liquid, a serum diluent, a TMB substrate, and a terminating liquid. The kit of the invention is applicable to the screening of large quantities of samples, and main reagents in the kit are provided in a form of operating fluid which is convenient for use.

The invention discloses a recombinant virus for expressing swine fever virus E2 gene, and a preparation method and application thereof. According to the preference of the codon, synthetic CSFV 2.1-type immunogenic gene E2 and 1.1-type E2 gene are respectively arranged in baculovirus pH and p10 promoters to be expressed so as to obtain a recombinant baculovirus (CCTCC NO:V201338). The exogenous gene expression level is enhanced. After being used for immunizing Japanese white rabbits and pigs, the subunit vaccine prepared by the E2 protein expressed by the recombinant baculovirus can induce the organism to generate specific immune reaction and protect the organism from the attack of the swine fever virus; and differential diagnoses can be utilized to distinguish the vaccine immunized animal from the wild virus-infected animal, thereby being beneficial to eradication and purification of the eradicate swine fever virus in the pig farm.

The invention discloses a triple fluorescent RT-PCR (Reverse Transcription-Polymerase Chain Reaction) detection reagent for African swine fever viruses, swine fever viruses and respiratory syndrome viruses and a preparation method and application thereof. Three sets of specific primers and Taqman probes as well as positive controls specific to African swine fever virus CP530R genes, swine fever virus 5 minute-UTR genes and swine respiratory syndrome virus NSP2 genes respectively are designed and synthesized, and a rapid, easy and convenient triple fluorescent RT-PCR detection system with high specificity and high sensitivity is established by using the three sets of primers and probes, so that nucleic acids of the African swine fever viruses, the swine fever viruses and the respiratory syndrome viruses can be detected synchronously from a detected sample within 3-4 hours in a rapid, accurate, specific, safe, easy and convenient way. The detection reagent can be applied to synchronous detection of the nucleic acids of trace African swine fever viruses, swine fever viruses and respiratory syndrome viruses in hogs and relevant samples thereof.

The invention discloses a dual fluorescence PCR detection reagent, a kit and a detection method for swine fever virus and African swine fever virus, and belongs to the field of animal pathogen detection. Aiming at a 5'-UTR gene of the swine fever virus and a P72 gene of the African swine fever virus, primers and probes capable of covering all strains and suitable for double detection are separately designed and screened, including two pairs of specific primers and two specific probes; the invention also describes a kit containing the primers and the probes and a PCR detection method using theprimers and the probes; the invention, through the design of the primers and the adjustment of each component of PCR, realizes purposes of one-time analysis and simultaneous detection and differentiation of the swine fever virus and the African swine fever virus on the premise of no reduction in sensitivity and specificity, which not only reduces the workload and cost of detection, but also greatly saves the detection time, thus gaining valuable time for epidemic disease prevention and treatment.

The invention discloses a monoclonal antibody against virulent strain E2 protein of classical swine fever virus and a hybridoma cell strain secreting the monoclonal antibody. The hybridoma cell strain is obtained by using hog cholera lapinized virus vaccine strain E2 protein expressed by Baculovirus as tolerogen, selecting Shimen strain E2 protein as immunogen, immunizing mouse by cyclophosphamide immunosuppression method, carrying out cell fusion, and sieving hybridoma cell strain capable of stably secreting monoclonal antibody against E2 protein. The monoclonal antibody can react with Shimen strain and can produce specific reaction with virulent strain of classical swine fever viruses of 1.1, 2.1, 2.2 and 2.3 gene sub-groups. The monoclonal antibody has neutralization activity and does not react with hog cholera lapinized virus vaccine strain, so that the monoclonal antibody can be used for differentiating virulent strain of classical swine fever virus and hog cholera lapinized virus vaccine strain, which establishes the foundation for establishing a method for differentiating wild virus infection of classical swine fever and vaccine immunity and for researching the molecular difference between CSFV virulent strain and mild strain.

The invention discloses a detection reagent and kit for an African swine fever virus and application of the detection reagent. The detection reagent for the African swine fever virus comprises a primer pair, comprising upstream primer and a downstream primer which have sequences as shown by SEQ ID NO: 1 and SEQ ID NO: 2; the end 5' of the upstream primer is labeled with a first nucleic acid marker, and the end 5' of the downstream primer is labeled with a second nucleic acid marker. The method for detecting the African swine fever virus, provided by the invention, is to amplify a gene segmentin a proper length by a labeled specific primer to guarantee high specificity of detection, and the accuracy of a detection result is improved; furthermore, the detection method provided by the invention avoids processes of diluting an amplification product, hybridizing probes and the like and maintains the advantages of intuitiveness, quickness, convenience, maturation, low cost and the like of an immune colloidal gold test strip.

The invention provides a monoclone antibody and application thereof. The monoclone antibody comprises a heavy chain as shown in SEQ ID No. 2 and a light chain as shown in SEQ ID No. 4. An enzyme-linked immunosorbent assay (ELISA) antibody detection kit (a blocking method) prepared with the monoclone antibody is good in sensitivity and high in specificity, and pigs infected with hog cholera virus can be detected more accurately. An ELISA antibody detection kit (a competition method) prepared with the monoclone antibody is short in detection time and can be used for quickly preliminarily screening pigs infected with the hog cholera virus and support further purification against the hog cholera virus. The monoclone antibody further has neutralizing activity and can further be used for preparing medicines for preventing and/or treating hog cholera relevant diseases.

The invention discloses a BAS-ELISA kit for detecting hog cholera virus Erns and E2 antigen, and belongs to the field of biological technologies and diagnosis and research of animal-borne diseases. The kit comprises an ELISA plate coated with a CSFV-Erns monoclonal antibody and a resistant-CSFV-E2 monoclonal antibody, a sample diluent, CSFV positive control and CSFV negative control, a scrubbing solution, a biotinylation rabbit-resistant CSFV-Erns polyclonal antibody and a biotinylation rabbit-resistant CSFV-E2 polyclonal antibody mixed solution, ELISA streptavidin, an enzyme developing substrate and a stop solution, wherein the two monoclonal antibodies and corresponding polyclonal antibodies have different epitopes. The kit adopts a biotin-avidin detecting system, and implements the combined detection for the hog cholera virus Erns and E2 protein, so that the sensitivity, specificity and repeatability in the detection of the hog cholera virus are greatly improved; the kit can be applied to the diagnosis and research of the hog cholera.

The invention discloses a fluorescence quantitative PCR agent box for quick-quantitative detecting swine-fever virus and swine-fever rabbit weak-virus bacterin, the method and the application. The agent box overcomes the shortage in traditional and modern method and can effectively make quantitative detection and quality supervisory control.

The invention discloses an African swine fever virus fluorescent type RAA detecting kit which comprises specific primers ASFV-F and ASFV-R and an RAA-exo probe ASFV-P. The basic groups in a target amplification subsequence are substituted by tetrahydrofuran (THF residues), dT-fluorophore and dT-quenching groups, a marked reported fluorescent dye is FAM, a fluorescent quenching group is BHQ-1, splitting decomposition can be conducted on the probe at the THF site by exonuclease in an agent, the fluorescent group can be separated from the quenching groups, and fluorescent signals are generated. By means of the kit, at the constant temperature of 37-42 DEG C, the African swine fever virus is detected within 20 minutes, the specificity is 100%, and the detection sensitivity is 10 copies per microliter. Thus, the kit has the advantages of being simple, rapid and sensitive in operation and provides effective technological means for on-site rapid detecting and screening of the African swine fever virus.

The invention relates to swine fever negative and positive serum reference materials and a preparation method thereof. The swine fever negative and positive serum reference materials are prepared by using China-domesticated, separated and identified swine fever viruses to immunize negative swine and adopting processes of sampling blood, separating serum, irradiating, filtering, split charging, freezing-drying, melting sealing, inspecting and the like, and by final cooperative calibration and constant value preparation. The swine fever negative and positive serum reference materials prepared by the method has the advantages that: the preparation process is scientific, strict and complete; the specificity is high; the application range is wide; and the accuracy of the constant value is high.

The invention relates to a method for preparing a genetic engineering product, in particular to a prokaryotic expression protein of VP73 gene from African swine fever virus (ASFV) and a preparation method thereof. The preparation method comprises: artificially synthesizing the whole-length sequence of VP73 gene according to the sequence of the VP73 gene from ASFV in GenBank, constructing a recombinant expression vector pET32a-VP73, sequencing, verifying, transforming prokaryotic expression recipient bacteria E.coli BL21(DE3), and inducing expression by isopropyl-1-thio-beta-d-galactopyranoside (IPTG), wherein the molecular weight of the recombinant fusion protein is about 65KD. Protein purified by nickel column affinity chromatography can undergo a specific immune imprinting reaction with ASFV positive serum and avoid cross reaction with viruses such as swine fever virus, hog cholera virus, porcine circovirus, porcine reproductive and respiratory syndrome virus, swine influenza virus and pseudorabiesvirus. Experiments show the expressed protein has high detection sensitivity, and high specificity. When the antigen is used for detection, risk of spreading poison is avoided. And the antigen can be used as a detection antigen for use in an enzyme-linked immuno sorbent assay (ELISA) method for identifying an ASFV antibody.

The invention provides a primer group and kit for African swine fever virus LAMP detection and application, and belongs to the technical field of biological detection. The kit has the advantages thatthe operation is simple, the requirements on equipment is low, and amplification can be completed by putting a detected sample and detection reaction liquid into a constant-temperature water bathing pot with the temperature of 58 DEG C to be hatched for 50 min when detection is conducted, the flexibility and specificity of the kit are high; the result is judged by observing the color changing of the reaction liquid through naked eyes, if the reaction liquid is yellow, it is indicated that African swine fever virus positive is detected, and if the reaction liquid is orange, it is indicated thatAfrican swine fever virus negative is detected. The method has the advantages of being visual and direct, and the aerosol contamination caused by the opening of a cover after the reaction is conducted can be effectively avoided.

The invention discloses a recombinant swine fever virus E2 protein swine source monoclonal antibody and a preparation method and application thereof. Firstly, the recombinant swine fever virus E2 protein swine source monoclonal antibody is disclosed, an amino acid sequence of a heavy chain is shown in SEQ ID NO.1, and an amino acid sequence of a light chain is shown in SEQ ID NO.2. The invention also discloses a suspension HEK293 cell line which can stably express the recombinant swine fever virus E2 protein swine source monoclonal antibody. The recombinant swine fever virus E2 protein swine source monoclonal antibody has the advantages that the coding genes of the heavy chain and light chain are cloned into an eukaryotic expression vector, and the stable and high-efficiency expression ofthe recombinant swine fever virus E2 protein swine source monoclonal antibody is realized by the suspension HEK293 cell line; the reactogenicity and neutralizing activity are good, and the important development value is realized in development of novel swine fever virus diagnosing and treating preparations.

The invention discloses a test paper for rapidly detecting swine fever antibody and a preparation method thereof. The inventive test paper consists of a sample pad (4), a glass fiber member (3), a cellulose nitrate membrane (2), a water absorbent pad (1) and a support (5); wherein the cellulose nitrate membrane contains a detection line (6) coated by swine fever virus E2 protein and a reference line (7) coated with rabbit anti swine fever antibody; and the glass fiber member is combined with swine fever virus E2 protein marked by colloidal gold. The test paper can rapidly detect possibly present swine fever antibody in a sample to achieve rapid detection and timely epidemic control, thus creating favorable conditions for further separation and identification. The test paper has the advantages of convenient, rapid and easy usage, clear result, easy generalization, and no need for special instrument and equipment as well as professionals, and is suitable for large-batch onsite detection for base layer and for sudden events. The test paper is suitable for epidemic inquisition and performs assistant effect on swine fever virus infection diagnosis.

The invention relates to a kit for quickly detecting a swine fever antibody. In the method, a pair of specific primers is designed, a relatively conservative gene sequence is cloned, an antigen aiming at a swine fever E2 protein is expressed through a pronucleus expression technology, and, on the basis, the kit containing an enzyme linked plate coated with a high-purity and high activity swine fever virus specificity antigen, an enzyme conjugate of rabbit-anti-swine monoclonal antibody containing an HRP (Horseradish Peroxidase) marker, a TMB (Tetramethylbenzidine) color developing liquid and the like is prepared. The kit can quickly detect the swine fever antibody in blood serum or blood plasma and has strong specificity and high sensitivity.

The invention discloses a two-color fluorescence quantitative polymerase chain reaction (PCR) combined detection method of swine fever virus and blue ear disease virus. By adopting the method, swine fever virus and blue ear disease virus in one sample to be detected can be detected and the loading level of the two viruses can be detected quantitatively. The invention also provides a kit used for the two-color fluorescence quantitative PCR combined detection of swine fever virus and blue ear disease virus. The detection method and kit are convenient and fast to operate and have high specificity and sensitive and reliable detection effect; and the minimum detection concentration is 1*10<2>copy/mu l.

The invention discloses a swine fever-porcine circovirus combined subunit vaccine, as well as a preparation method and an application thereof, and belongs to the technical fields of animal vaccines and veterinary biological products. The vaccine is prepared from swine fever virus E2 protein, porcine circovirus type 2 cap protein and a pharmaceutically acceptable adjuvant. The preparation method comprises the following steps: (1) preparing swine fever virus E2 protein and porcine circovirus type 2 cap protein; (2) preparing an antigen solution from the swine fever virus E2 protein and porcine circovirus type 2 cap protein prepared in the step (1); and (3) mixing and stirring the antigen solution and Montanide GEL 01PR adjuvant in a mass ratio of 10:1. The vaccine has the advantages of strong immunogenicity, good safety, no immune interference and the like, can be used for preventing potential biological safety hazard for virus variation and fundamentally purifying swine fever virus and porcine circovirus type 2, and can achieve the effect of dual prevention with one injection by immunizing the vaccine to achieve the aims of saving time, labor and cost.

The invention discloses a swine feed additive with effects of enhancing immunity and deodorizing. Through oligosaccharide in a formula, intestinal environment of the swine is regulated, and release of ammonia gas and hydrogen sulfide is reduced, so as to improve the environment of a pigsty; and an echinacea extract and other materials in the formula can combine to enhance the immunity of the swine and to take a quite strong effect on inhibiting swine fever viruses, so as to prevent and treat the swine fever. The swine feed additive disclosed by the invention can remarkably reduce contents of nitrogen, phosphor, hydrogen sulfide, organic amine and the like in the swine manure, and has a good deodorizing effect. The feed additive further can enhance the immunity of the swine, and take a quite strong effect on inhibiting swine fever viruses, so as to prevent and treat the swine fever, improve the health degree of the swine, reduce disease possibility of the healthy swine and reduce the death rate of the sick swine.

The invention belongs to the technical field of biological medicine, and concretely relates to a swine fever virus subunit vaccine and a preparation method and a purpose thereof. The invention provides a kluyveromyces marxianus yeast recombination strain used for preparing the swine fever virus subunit vaccine. The recombination strain is constructed by the following steps: swine fever virus envelope protein E2 is intercepted, through codon optimization, a coding sequence of the swine fever virus mE2 protein is obtained, and then is cloned to a kluyveromyces marxianus yeast expression vector,and the kluyveromyces marxianus yeast host strain is transformed. The invention also provides the method for preparing the swine fever virus subunit vaccine, which comprises the following steps: the kluyveromyces marxianus yeast host strain is subjected to recombination expression by using mE2, steps of culture, centrifugation, cell disruption, and separating purifying are carried out to obtain the swine fever virus mE2 protein antigen, and the purified antigen and an adjuvant are subjected to complex formulation to prepare the swine fever virus subunit vaccine. The injection immunotherapy ofswine fever virus mE2 protein recombination subunit vaccine can obtain a protective IgG antibody, and the subunit vaccine can reduce and prevent the swine fever virus infection-related disease.

The invention relates to a citric acid composite disinfectant, which is composed of mixed components of, by weight: 12 to 32 parts of organic chlorine, 3 to 13 parts of citric acid, and 55 to 85 parts of sodium sulfate. When in use, according to different demands, the composite disinfectant can be dissolved with water, and can be diluted to a required concentration. After the composite disinfectant is dissolved, good sterilizing efficacy is maintained, disinfection effect is substantially improved, irritating odor is small, and stability of the product is enhanced. The product is safe and environment protecting, and has characteristics of broad spectrum and high efficiency. The product has substantial killing effects against pathogenic microorganisms such as foot-and-mouth disease virus, swine fever virus, swine vesicular disease virus, Newcastle disease virus, bursa disease virus, escherichia coli, and staphylococcus.