7Top FH Jr, Russell PK. Swine influenza A at Fort Dix, New Jersey (January-February 1976 ).Ⅳ. Summary and speculation. J Infect Dis, 1977,136(S) :376-380
8Claas EC, Kawaoka Y, de Jong JC, et al. Infection of children with avian-human reassortant influenza virus from pigs in Europe. Virology, 1994,204( 1 ) :453-457
9Gregory V, Lim W, Cameron K, et al. Infection of a child in Hong Kong by an influenza A H3N2 virus closely related to viruses circulating in European pigs. J Gen Virol,2001,82 (Pt 6): 1397-1406
10Gregory V, Bennett M, Thomas Y, et al. Human infection by a swine influenza A (H1N1) virus in Switzerland. Arch Virol, 2003,148 (4) :793-802