2W1ECZOREK, KROHMER M,WEILOND F, et al. Porcine reproductive and respiratory syndrome virus (PRRSV) : monoelonal antibodies detect common epitopes on two viralproteins of European and US isolates [ J]. Vet Microbiol, 1996,51:257 - 266.
3MENG X J, PAULP S, HALBUR P G, et al. Phylogenetic analysis of the putative M (ORF6) and N ( ORF7 ) genes of Porcine reproductive and respiratory syndrome virus ( PRRSV ) implications for the existence of two genotypes of PRRSV in the USA and Europe [J].Arch Virol ,1995(140) :745 -755.
7SUR J H, COPPER V L, GALEOTA J A. Invivo detection of PRRSV RNA by in situ hybridization at different times post infection [J].J Clin Microbiol, 1996, 34 (9):2280-2286.
8Larochelle R,Magar R.Diferentiation of North American and European porcine reproductive and respiratory syndrome virus genotypes by in situ hybridization[J].Journal of Virology Methods,1997,68(2):161-168.