为了解2010年河北省猪繁殖与呼吸综合征病毒变异趋势,用RT—PCR方法对2010年河北省发病猪场的病料进行PRRSV Nsp2和0RF5基因扩增、克隆和测序,利用DNAStar软件对所测序列进行分析。结果显示,扩增的Nsp2基因氨基酸序列相似性为91.4%~98.8%,与GenBank中参考毒株的氨基酸序列相似性为61.4%~99.4%;扩增的ORF5基因龚基酸序列相似性为95%~99.5%,与VR-2332和MLV的相似性分别为84.6%~88.6%和84.1%-87.6%;从2010年的病料中扩增的%To investigate the variation of porcine reproductive and respiratory syndrome virus in Hebei province, samples collected from six intensive pig farms suffered from PRRSV in 2010 were used for RT-PCR. The ORF5 and Nsp2 genes were subjected to PCR amplifica
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