7Brown I H,Alexander D J,Chakraverty P,et al.Isolation of an influenza Avirus of unusual subtype (H1N7)from pigs in England, and the subsequent experimental transmission from pig to pig[J]. Veterinary Microbiology, 1994,39(1-2): 125-134.
8Karasin A L,Olsen C W,Brown I H,et al.H4N6 influenza virus isolated from pigs in Ontario[J].The Canadian Veterina-ry Journal, 2000,41(12):938-939 .
9Clarification sought on ovarian influenza virus in pigs [J] . Veterinary Record:Journal of the British Veterinary Association, 2004, 155(9):250-252 .
2WEBBY R J,SWENSEN S L,KRAUSS S L,et al.Evolution of swine H3N2 influenza virues in the United State[J].J Viro,2000,74(18):8243-8251.
3PEIRIS J S M,GUAN Y,MARKWELL D,et al.Cocirculation of avian H9N2 and contemporary“human”H3N2 influenza A viruses in pigs in southeastern China:potential for genetic reassortment?[J].J Virol,2001,75(20):9679-9686.