4OLSEN B, MUNSTER V J, WALLENSTEN A, et al. Global pat- terns of Influenza A virus in wild birds [ J]. Science, 2006, 312 ( 5772 ) : 384 - 388.
5GUAN Y, SHORTIDGE K F, KRAUS S, et al. ization of H9N2 Influenza viruses: were they the donors of the "in- ternal"genes of H5N1 viruses in Hong Kong? [J]. PNSA, 1999, 96(16) : 9363 -9367.
6KAGEYARMA T, FUJISAKI S, TAKASHITA E, et al. Genetic a- nalysis of novel avian A(H7N9) Influenza viruses isolated from pa- tients In China, February to April 2013 [ J ]. Euro Surveill, 2013, 18 ( 15 ) :20453.
7QI w B, ZHOU x, SHI W, et al. Genesis of the novel human - in- fecting hlfluenza A( H10N8 ) virus and potential genetic diversity of the virus in poultry, China [ J]. Euro Surveill, 2014, 19 (25) : 20841.
8GUO Y J, KRAUSS S, SENNE D A, et al. Characterization of the Pathogenicity of members of the newly established H9N2 Influenza virus lineages in Asia [J]. Virology,2000,267(2) :279 -288.
9LEWIS N S,JAVAKHISHVILI Z,RUSSELL C A,et al.Avian influenza virus surveillance in wild birds in Georgia:2009—2011[J].PLo S One,2013,8(3):e58534.
10de MARCO M A,FONI E,CAMPITELLI L,et al.Long-term monitoring for avian influenza viruses in wild bird species in Italy[J].Vet Res Commun,2003,27(Suppl1):107-114.