8Gregor M. Molecular cloning and nucleotide sequence of the genome of hog cholera virus[J]. Virology, 1989, 171:555-567.
9Oliveira S, Galina L, Pijoan C. Development of a PCR test to diagnose Haem ophilus parasuis infections[J]. Vet Diagn Invest,2001 ,13(6):495-501.
10Tian Kegong, Yu Xiuling, Zhao Tiezhu, et al. Emergence of fatal PRRSV variants:unpar- outbreaks of atypical PRRS in China and molecular dissection of the unique alleled hallmark [J]. PLoS ONE, 2007,2 ( 6 ):526.