1Ian H B. The pig as anintermediate host for influenza A viru- ses between birds and humans[J]. International Congress Se ries, 2001,1219 : 173-178.
2Rota P A, Rocha E P, Harmon M W. Laboratory characterization of a swine influenza virus isolated from a fatal case of human influenza[J]. J Clin Microbiol,1989, 27 : 1413-1416.
3Wentworth D E, Thompson B L, Xu X. An influenza A (H1N1) virus, closely related to swine influenza virus, responsible for a fatal case of human influenza[J]. Journal of Virology, 1994,68 : 2051-2058.
4Gregory V, Bennett M, Thomas Y. Human infection by a swine influenza A(HIN1) virus in Switzerland[J]. Arch Virol, 2003, 148:793- 802.
5Rudolf R. The pathogenic determinant of influenza virus[J]. Veterinary Microbiology, 1992,33: 303-310.
2Butt K M,Smith G J D,Chen H,Zhang L J,Leung Y H C,Xu K M,Lim W,Webster R G,Yuen K Y,Peiris J S,Guan Y. Human infection with an avian H9N2 influenza A virus in Hong Kong in 2003[J].Journal of Clinical Microbiology,2005,(11):5760-5767.doi:10.1128/JCM.43.11.5760-5767.2005.
3Steiubauer D A. Role of hemagglutinin cleavage for the pathogenicity of influenza virus[J].Virology,1999.1-20.
