6Mege D, Lefevre F, Labonnardiere C. The porcine family of interferon-omega: cloning, structural analysis, and functional studies of five related genes[J].J Interferon Res, 1991,11(6) :341.
7Overend C, Mitchell R, He D,et al. Recombinant swine beta interferon protects swine alveolar macrophages and MARC- 145 cells from infection with porcine re- productive and respiratory syndrome virus[J]. Gener Virol, 2007,88 : 925-931.
8Tian Kegong, Yu Xiuling, Zhao Tiezhu, et al. Emergence of fatal PRRSV variants: unpar-alleled outbreaks of atypical PRRS in China and molecular dissection of the unique hallmark[J]. J PLoS ONE, 2007,2 : 1-10.