6Albina E.Epidemiology of porcine reproductive and respiratory syndrome(PRRS):an overview[J].Vet Microbiol,1997,55(1-4):309-316.
7Van Alstine W G,Stevenson G W,Kanitz C L.Diagnosis of porcine reproductive and respiratory syndrome[J].Swine Health and Production,1993,1(4):24-28.
8Albina E,Madec F,Cariolet R,et al.Immune response and persistence of the porcine reproductive and respiratory syndrome virus in infected pigs and farm units[J].Vet Rec,1994,134:567-573.
9Park B K,Joo H S,Dee S A,et al.Evaluation of an indirect fluorescent IgM antibody test for the detection of pigs with recent infection of porcine reproductive and respiratory syndrome virus[J].J Vet Diagn Invest,1995,(7):544-546.
7Allende R,Lewis T, Lu Z,et al. North American and European Porcine reproductive and respiratory syndrome viruses differ in nonstructural protein coding regions [ J]. Gen Virol, 1999, 80 307-315.
8Shen S, Kwang J, Liu W, et al. Determination of the complete nu cleotide sequence of a vaccine strain of porcine reproductive and respiratory syndrome virus and identification of the Nsp2 gene with a unique insertion[J]. Arch Virol, 2000,145:871 -883.
9Walker N J. Real-time and quantitantive PCR, applications to mechanism-based toxicology[J]. Bioehem Mol Toxicol, 2001,15 (3) : 121-127.
