5Webster RG, Bean WJ, Gorman OT, et a1. Evolution and ecology of influenza A viruses[J]. Microbiol Rev, 1992,56(1):152-179.
6Xiang NJ,Shi Y,Wu JB,et al. Knowledge, attitudes and practices(KAP) relating to avian influenza in urban and rural areas of China [J]. BMC Infectious Diseases, 2010,10(1):34.