1 Alexander D J. Summary of avian influenza activity in Europe, Asia, Africa, and Australasia, 2002~2006. Avian Dis, 2007, 51: 161-166
[2]
2 Cox N J, Subbarao K. Global epidemiology of influenza: past and present. Annu Rev Med, 2000, 51: 407-421
[3]
3 Iqbal M, Yaqub T, Mukhtar N, et al. Infectivity and transmissibility of H9N2 avian influenza virus in chickens and wild terrestrial birds. Vet Res, 2013, 44: 100
5 Wang J Y, Ren J J, Liu W H, et al. Complete genome sequence of a new H9N2 avian influenza virus isolated in China. Genome Announc, 2013, 1: e00261-13
[6]
6 Zhao M, Liu Q, Sun Q, et al. Full genome sequence of a natural reassortant H9N2 avian influenza virus isolated from domestic ducks in Jiangsu Province, China. Genome Announc, 2013, 1: e00463-13
8 Post J, de Geus E D, Vervelde L, et al. Systemic distribution of different low pathogenic avian influenza (LPAI) viruses in chicken. Virol J, 2013, 10: 23
[9]
9 Srinivasan K, Raman R, Jayaraman A, et al. Quantitative characterization of glycan-receptor binding of H9N2 influenza A virus hemagglutinin. PLoS One, 2013, 8: e59550
13 World Organization for Animal Health (OIE). “Newcastle disease,” in Manual of Diagnostic Tests and Vaccines for Terrestrial Animals (Mammals, Birds and Bees). Paris: OIE (Office International des Epizooties), 2008. 576-589
15 Li C, Yu K, Tian G, et al. Evolution of H9N2 influenza viruses from domestic poultry in Mainland China. Virology, 2005, 340: 70-83
[16]
16 Lee Y J, Shin J Y, Song M S, et al. Continuing evolution of H9 influenza viruses in Korean poultry. Virology, 2007, 359: 313-323
[17]
17 Stephenson I, Nicholson K G, Gluck R, et al. Safety and antigenicity of whole virus and subunit influenza A/Hong Kong/1073/99 (H9N2) vaccine in healthy adults: phase I randomised trial. Lancet, 2003, 362: 1959-1966
27 Bonfante F, Patrono L V, Aiello R, et al. Susceptibility and intra-species transmission of the H9N2 G1 prototype lineage virus in Japanese quail and turkeys. Vet Microbiol, 2013, 165: 177-183
[20]
28 Chen Q, Huang S, Chen J, et al. NA proteins of influenza A viruses H1N1/2009, H5N1, and H9N2 show differential effects on infection initiation, virus release, and cell-cell fusion. PLoS One, 2013, 8: e54334
[21]
29 Qin G, Liu Y, Zheng J, et al. Type 1 responses of human Vg9Vd2 T cells to influenza A viruses. J Virol, 2011, 85: 10109-10116
[22]
30 Uyeki T M, Nguyen D C, Rowe T, et al. Seroprevalence of antibodies to avian influenza A (H5) and A (H9) viruses among market poultry workers, Hanoi, Vietnam, 2001. PLoS One, 2012, 7: e43948
[23]
31 Takakuwa H, Yamashiro T, Le M Q, et al. The characterization of low pathogenic avian influenza viruses isolated from wild birds in northern Vietnam from 2006 to 2009. Comp Immunol Microb, 2013, 36: 581-590
[24]
32 Zhu G, Wang R, Xuan F, et al. Characterization of recombinant H9N2 influenza viruses isolated from wild ducks in China. Vet Microbiol, 2013, 166: 327-336
[25]
33 Sun Y, Qin K, Wang J, et al. High genetic compatibility and increased pathogenicity of reassortants derived from avian H9N2 and pandemic H1N1/2009 influenza viruses. Proc Natl Acad Sci USA, 2011, 108: 4164-4169
[26]
19 Huang Y, Hu B, Wen X, et al. Diversified reassortant H9N2 avian influenza viruses in chicken flocks in northern and eastern China. Virus Res, 2010, 1: 26-32
[27]
20 Meng D, Hui Z, Yang J, et al. Reduced egg production in hens associated with avian influenza vaccines and formalin levels. Avian Dis, 2009, 53: 16-20
[28]
21 Zhang P, Tang Y, Liu X, et al. Characterization of H9N2 influenza viruses isolated from vaccinated flocks in an integrated broiler chicken operation in eastern China during a 5 year period (1998~2002). J Gen Virol, 2008, 89: 3102-3112
[29]
22 杨汉春. 动物免疫学. 北京: 中国农业大学出版社, 1996. 146-147
[30]
23 Bano S, Naeem K, Malik S A. Evaluation of pathogenic potential of avian influenza virus serotype H9N2 in chickens. Avian Dis, 2003, 47: 817-822
[31]
24 Coman A, Maftei D N, Krueger W S, et al. Serological evidence for avian H9N2 influenza virus infections among Romanian agriculture workers. J Infect Public Health, 2013, 6: 438-447
[32]
25 Lin Y P, Shaw M, Gregory V, et al. Avian-to-human transmission of H9N2 subtype influenza a viruses: relationship between H9N2 and H5N1 human isolates. Proc Natl Acad Sci USA, 2000, 97: 9654-9658