6Waddilove J.Immunosuppressive viruses a new pattern in pig disease[J].Pig International,1996,26(8):27-28.
7Li H Y,Yu K Z,Xin X G,et al.Serological and virologic surveillance of swine influenza in China from 2000 to 2003[J].International Congress Series,2004,1263:754-757.
8Xu C T,Fan W X,Wei R,et al.Isolation and identifyication of swine influenza recombinant A/Swine/Shandong/1/2003(H9N2) virus[J].Microbes and Infection.,2004,6:919-925.
9Barigazzi G,Donatelli I.Swine influenza in Italy[J].Veterinary Research Communications,2003,27 (1):93-99.
10Gregory V,Bennett M,Thomas Y,et al.Human infection by a swine influenza A(HIN1) virus in Switzerland[J].Arch Virol,2003,148:793-802.