A dual real-time quantitative polymerase chain reaction assay (drtqPCR) was established to detect and differentiate between Porcine circovirus-2a (PCV-2a) and Porcine circovirus-2b (PCV-2b). Genotype-specific primer s...A dual real-time quantitative polymerase chain reaction assay (drtqPCR) was established to detect and differentiate between Porcine circovirus-2a (PCV-2a) and Porcine circovirus-2b (PCV-2b). Genotype-specific primer sets and probes were designed by using sequence data published for different PCV-2 strains. Specificity and sensitivity of the drtqPCR were examined by using PCV-2 isolates with known genotype. Among 367 tissue samples, 44.69% (164/367) were PCV-2 positive. From 164 PCV-2 positive samples, 10.98% (18/164), 92.56% (137/164), and 3.31% (9/164) were positive for PCV-2a, PCV-2b, and both genotypes, respectively. These results suggest that the dif-ferential drtqPCR can be used to detect PCV-2 and to differentiate the 2 genotypes from field sam-ples. The PCV-2 infection is quite common in swine of Shanghai area. Furthermore, the PCV-2b infective ratio is far higher than PCV-2a, and PCV-2a/2b mixed infections are also observed but at a lower prevalence in Shanghai area.展开更多
[ Objective ] The aim of the study was to construct associated DNA vaccine of PRRS （Porcine reproductive and respiratory syndrome） and PCV-2 （Porcine circovirus type 2） disease and study its immunogenicity. [ Meth...[ Objective ] The aim of the study was to construct associated DNA vaccine of PRRS （Porcine reproductive and respiratory syndrome） and PCV-2 （Porcine circovirus type 2） disease and study its immunogenicity. [ Method] In_ this study, the ORF5 gene of PRRSV isolated in Liaoning was cloned into plRES-neo expression vector, and the neo gene of plRES-neo expression vector was substituted by the ORF2 gene of the PCV-2 Mongolia strain to construct the recombinant expression vector. The expression in BHK cells was detected through Western blot and IFA. Then the ELISA antibody level and the number of spleen T lymphocytes were detected after Balb/c mice were immunized with this DNA vaccine. E Result] The recombinant plasmid plRES-ORF2-ORF5 was constructed successfully and could express the target proteins in BHK cells, as indicated by Western blot and IFA. There was no significant difference in ELISA antibody between plRES-ORF2-ORF5 immunized group and inactived vaccine immunized groups, while the number of spleen T lymphocytes induced by DNA vaccine was higher than that induced by inactived vaccine. [ Conclusion] The recombinant plasmid plRES-ORF2-ORF5 should induce good humoral immune response and cellular immune response in mice, providing the conditions for better prevention and control of PRRS and PCV-2 disease.展开更多
为研究从猪血清中分离的猪圆环病毒2型（Porcine circovirus type 2,PCV-2）与从发病猪组织中分离的PCV-2之间的差异、了解贵州地区PCV-2遗传变异情况、丰富贵州PCV-2全基因组序列库,试验采用来自贵州省毕节市金沙县、遵义市绥阳县、毕...为研究从猪血清中分离的猪圆环病毒2型（Porcine circovirus type 2,PCV-2）与从发病猪组织中分离的PCV-2之间的差异、了解贵州地区PCV-2遗传变异情况、丰富贵州PCV-2全基因组序列库,试验采用来自贵州省毕节市金沙县、遵义市绥阳县、毕节市黔西县和贵阳市修文县的PCV-2抗体阳性猪血清,通过PCR扩增及通过T克隆获得了4株PCV-2全基因,分别命名为GZ-JS2015、GZSY2016、GZ-QX2014和GZ-XW2014,并进行测序;将测序结果与笔者收集的38株PCV-2的核苷酸序列进行比对分析。结果表明：在病毒血症期间猪血清中分离的PCV-2与从发病猪组织中分离的PCV-2并无太大差异;笔者收集的血清中贵州省为10株,其中8株为PCV-2b型、2株为PCV-2a型,说明在贵州地区流行的主要是PCV-2b型;来自贵州省同一地区的2株PCV-2处于不同的进化树分支上,与省外的PCV-2分离株亲缘关系较近,提示在贵州省流行的部分PCV-2可能由引种时流入。展开更多
文摘A dual real-time quantitative polymerase chain reaction assay (drtqPCR) was established to detect and differentiate between Porcine circovirus-2a (PCV-2a) and Porcine circovirus-2b (PCV-2b). Genotype-specific primer sets and probes were designed by using sequence data published for different PCV-2 strains. Specificity and sensitivity of the drtqPCR were examined by using PCV-2 isolates with known genotype. Among 367 tissue samples, 44.69% (164/367) were PCV-2 positive. From 164 PCV-2 positive samples, 10.98% (18/164), 92.56% (137/164), and 3.31% (9/164) were positive for PCV-2a, PCV-2b, and both genotypes, respectively. These results suggest that the dif-ferential drtqPCR can be used to detect PCV-2 and to differentiate the 2 genotypes from field sam-ples. The PCV-2 infection is quite common in swine of Shanghai area. Furthermore, the PCV-2b infective ratio is far higher than PCV-2a, and PCV-2a/2b mixed infections are also observed but at a lower prevalence in Shanghai area.
文摘[ Objective ] The aim of the study was to construct associated DNA vaccine of PRRS （Porcine reproductive and respiratory syndrome） and PCV-2 （Porcine circovirus type 2） disease and study its immunogenicity. [ Method] In_ this study, the ORF5 gene of PRRSV isolated in Liaoning was cloned into plRES-neo expression vector, and the neo gene of plRES-neo expression vector was substituted by the ORF2 gene of the PCV-2 Mongolia strain to construct the recombinant expression vector. The expression in BHK cells was detected through Western blot and IFA. Then the ELISA antibody level and the number of spleen T lymphocytes were detected after Balb/c mice were immunized with this DNA vaccine. E Result] The recombinant plasmid plRES-ORF2-ORF5 was constructed successfully and could express the target proteins in BHK cells, as indicated by Western blot and IFA. There was no significant difference in ELISA antibody between plRES-ORF2-ORF5 immunized group and inactived vaccine immunized groups, while the number of spleen T lymphocytes induced by DNA vaccine was higher than that induced by inactived vaccine. [ Conclusion] The recombinant plasmid plRES-ORF2-ORF5 should induce good humoral immune response and cellular immune response in mice, providing the conditions for better prevention and control of PRRS and PCV-2 disease.
文摘为研究从猪血清中分离的猪圆环病毒2型（Porcine circovirus type 2,PCV-2）与从发病猪组织中分离的PCV-2之间的差异、了解贵州地区PCV-2遗传变异情况、丰富贵州PCV-2全基因组序列库,试验采用来自贵州省毕节市金沙县、遵义市绥阳县、毕节市黔西县和贵阳市修文县的PCV-2抗体阳性猪血清,通过PCR扩增及通过T克隆获得了4株PCV-2全基因,分别命名为GZ-JS2015、GZSY2016、GZ-QX2014和GZ-XW2014,并进行测序;将测序结果与笔者收集的38株PCV-2的核苷酸序列进行比对分析。结果表明：在病毒血症期间猪血清中分离的PCV-2与从发病猪组织中分离的PCV-2并无太大差异;笔者收集的血清中贵州省为10株,其中8株为PCV-2b型、2株为PCV-2a型,说明在贵州地区流行的主要是PCV-2b型;来自贵州省同一地区的2株PCV-2处于不同的进化树分支上,与省外的PCV-2分离株亲缘关系较近,提示在贵州省流行的部分PCV-2可能由引种时流入。
