Abstract:We analyzed the evolutional and molecular characteristics of Hemagglutinin(HA), Neuraminidase(NA) and non-structural(NS) genes of avian influenza A(H9n2) viruses from environment in poultry markets in Changsha, China, 2014, providing laboratory data for prevention and control of human infection with avian influenza A(H9N2) virus. Five hundred and one specimens (263 poultry drinking water specimens, 226 poultry sewage specimens and 17 others specimens) were collected from environment in poultry markets in Changsha, 2014, and real-time RT-PCR was used for influenza A typing and subtyping (H5, H7 and H9) detection. HA and NA universal primer sets for conventional RT-PCR and sequencing were used for the positivity of single H9. The sequence homology of HA, NA and NS genes of the viruses were analyzed with the online Basic Local Alignment Search Tool (BLAST). The ClustalW multiple alignments of amino acids and the phylogenetic trees for HA, NA and NS genes were constructed using the BioEdit and MEGA 5 software, respectively. Results showed that among 501 environmental samples, 350 samples were positive for influenza A virus, 191 (38.12%) for H9 subtype, 177 (35.33%) for H5 subtype, 11 (2.20%) for H7 subtype and 68 (13.57%) for H5 and H9 subtypes co-detection. Twenty-three H9N2 subtype AIV were confirmed by conventional RT-PCR and sequencing from the samples of the positivity of single H9. Phylogenetic analysis revealed that most of HA, NA and NS genes of the H9N2 subtype AIV isolated in Changsha City had gene constellations of genotype S,and these virues might have acquired their HA, NA and NS from A/Chicken/Shanghai/F/1998-like (H9N2). L235 (correspond to H3 numbering 226) of the HA protein of the receptor binding site (RBS) were found in these H9N2 viruses, and the characteristics was shown to be associated with increased affinity of HA to the glycan-receptors of human influenza virus, and the low pathogenicity molecular characteristics of HA, NA and NS genes were showed in these viruses. The positive rate of nucleic acid of the H9 subtype of avian influenza virus from environment was the highest in poultry markets in Changsha, 2014, and molecular characteristics of the HA, NA and NS of these H9N2 subtype AIV showed low pathogenicity, but that may facilitate human infection. So, the prevalence and genetic evolution of this virus should be closely monitored.
[1] Tong S, Zhu X, Li Y, et al. New world bats harbor diverse influenza A viruses[J]. PLoS Pathog, 2013, 9(10): e1003657. doi:10.1371/journal.ppat.1003657 [2] Tong S, Li Y, Rivailler P, et al. A distinct lineage of influenza A virus from bats[J]. Proc Natl Acad Sci U S A, 2012, 109(11): 4269-4274. doi:10.1073/pnas.1116200109 [3] Pan M, Gao R, Lv Q, et al. Human infection with a novel, highly pathogenic avian influenza A (H5N6) virus: Virological and clinical findings[J]. J Infect, 2016, 72(1): 52-59. doi:10.1016/j.jinf.2015.06.009 [4] Koopmans M, Wilbrink B, Conyn M, et al. Transmission of H7N7 avian influenza A virus to human beings during a large outbreak in commercial poultry farms in the Netherlands[J]. Lancet, 2004, 363(9409): 587-593. doi:10.1016/S0140-6736(04)15589-X [5] Hirst M, Astell CR, Griffith M, et al. Novel avian influenza H7N3 strain outbreak, British Columbia[J]. Emerg Infect Dis, 2004, 10(12): 2192- 2195. doi:10.3201/eid1012.040743 [6] Ogata T, Yamazaki Y, Okabe N, et al. Human H5N2 avian influenza infection in Japan and the factors associated with high H5N2-neutralizing antibody titer[J]. J Epidemiol, 2008, 18(4): 160-166. doi:10.2188/jea.JE2007446 [7] Cheng VC, Chan JF, Wen X, et al. Infection of immunocompromised patients by avian H9N2 influenza A virus[J]. J Infect, 2011, 62(5): 394-399. doi:10.1016/j.jinf.2011.02.007 [8] To KK, Ng KH, Que TL, et al. Avian influenza A H5N1 virus: a continuous threat to humans[J]. Emerg Microbes Infect, 2012, 1(9): e25. doi:10.1038/emi.2012.24 [9] Ostrowsky B, Huang A, Terry W, et al. Low pathogenic avian influenza A (H7N2) virus infection in immunocompromised adult, New York, USA, 2003[J]. Emerg Infect Dis, 2012, 18(7): 1128-1131. doi:10.3201/eid1807.111913 [10] Arzey GG, Kirkland PD, Arzey KE, et al. Influenza virus A (H10N7) in chickens and poultry abattoir workers, Australia[J]. Emerg Infect Dis, 2012, 18(5): 814-816. doi:10.3201/eid1805.111852 [11] Wei SH, Yang JR, Wu HS, et al. Human infection with avian influenza A H6N1 virus: an epidemiological analysis[J]. Lancet Respir Med, 2013, 1(10): 771-778. doi:10.1016/S2213-2600(13)70221-2. [12] Chen H, Yuan H, Gao R, et al. Clinical and epidemiological characteristics of a fatal case of avian influenza A H10N8 virus infection: a descriptive study[J]. Lancet, 2014, 383(9918): 714-721. doi:10.1016/S0140-6736(14)60111-2 [13] Zhang R, Chen T, Ou X, et al. Clinical, epidemiological and virological characteristics of the first detected human case of avian influenza A(H5N6) virus[J]. Infect Genet Evol, 2016, 40: 236-242. doi:10.1016/j.meegid.2016.03.010 [14] Freidl GS, Meijer A, de Bruin E, et al. Influenza at the animal-human interface: a review of the literature for virological evidence of human infection with swine or avian influenza viruses other than A(H5N1)[J]. Euro Surveill, 2014, 19(19): 8-26. doi:10.2807/1560-7917 [15] Gao R, Cao B, Hu Y, et al. Human infection with a novel avian-origin influenza A (H7N9) virus[J]. N Engl J Med, 2013, 368(20): 1888-1897. doi:10.1056/NEJMoa1304459 [16] Senne DA, Panigrahy B, Kawaoka Y, et al. Survey of the hemagglutinin (HA) cleavage site sequence of H5 and H7 avian influenza viruses: amino acid sequence at the HA cleavage site as a marker of pathogenicity potential[J]. Avian Dis, 1996, 40(2): 425-437. doi:10.2307/1592241 [17] Srinivasan K, Raman R, Jayaraman A, et al. Quantitative description of glycan-receptor binding of influenza A virus H7 hemagglutinin[J]. PLoS One, 2013, 8(2): e49597. doi:10.1371/journal.pone.0049597 [18] Shu YL,Lan Y,Wen LY, et al.Analysis of human H5N1 virus hemagglutinin gene isolated from the mainland of China[J]. Chin J Exp Clin Virol, 2006, 20(2): 8-10. doi:10.3760/cma.j.issn.1003-9279.2006.02.003 (in Chinese) 舒跃龙,蓝雨,温乐英,等.我国分离人H5N1禽流感病毒血凝素基因特性的研究[J]. 中华实验和临床病毒学杂志,2006,20(2):8-10. [19] Mckimm-Breschkin JL, Sahasrabudhe A, Blick TJ, et al. Mutations in a conserved residue in the influenza virus neuraminidase active site decreases sensitivity to Neu5Ac2en-derived inhibitors[J]. J Virol, 1998, 72(3): 2456-2462. [20] Jiao P, Tian G, Li Y, et al. A single-amino-acid substitution in the NS1 protein changes the pathogenicity of H5N1 avian influenza viruses in mice[J]. J Virol, 2008, 82(3): 1146-1154. doi:10.1128/JVI.01698-07 [21] Jackson D, Hossain MJ, Hickman D, et al. A new influenza virus virulence determinant: the NS1 protein four C-terminal residues modulate pathogenicity[J]. Proc Natl Acad Sci U S A, 2008, 105(11): 4381-4386. doi:10.1073/pnas.0800482105 [22] Huang Y, Li X, Zhang H, et al. Human infection with an avian influenza A (H9N2) virus in the middle region of China[J]. J Med Virol, 2015, 87(10): 1641-1648. doi:10.1002/jmv.24231 [23] Wan XF, Dong L, Lan Y, et al. Indications that live poultry markets are a major source of human H5N1 influenza virus infection in China[J]. J Virol, 2011, 85(24): 13432-13438. doi:10.1128/JVI.05266-11 [24] Shi J, Deng G, Liu P, et al. Isolation and characterization of H7N9 viruses from live poultry markets-Implication of the source of current H7N9 infection in humans[J]. Chin Sci Bull, 2013, (16): 1857-1863. doi:10.1007/s11434-013-5873-4 [25] Zhang T, Bi Y, Tian H, et al. Human infection with influenza virus A(H10N8) from live poultry markets, China, 2014[J]. Emerg Infect Dis, 2014, 20(12): 2076-2079. doi:10.3201/eid2012.140911 [26] Zhang RS, Ou XH, Song KY, et al. Risk related to the transmission of H5N1 subtype avian influenza virus in the environment of poultry markets in Changsha, China[J]. Chin J Epidemiol, 2012, 33(8): 768-773. doi:10.3760/cma.j.issn.0254-6450.2012.08.003 (in Chinese) 张如胜,欧新华,宋克云, 等. 长沙市家禽市场环境中H5N1亚型禽流感病毒传播风险研究[J]. 中华流行病学杂志, 2012, 33(8): 768-773. [27] Zhang RS, Sun BC, Yao D, et al. Evolution of the HA, NA and NS genes of H5N1 avian influenza viruses from sewage in live bird markets in Changsha, 2014[J]. Chin J Zoonoses, 2017, 33(1): 85-88, 80. doi:10.3969/j.issn.1002-2694.2017.01.016 (in Chinese) 张如胜, 孙边成, 姚栋, 等. 2014年长沙市活禽市场污水中H5N1亚型禽流感病毒HA、NA及NS基因进化分析[J]. 中国人兽共患病学报, 2017, 33(1): 85-88, 80. [28] Ministry of Health of the People’s Republic of China. National influenza surveillance program (2010)[EB/OL]. (2010-09-10)[2017-02-23]. http://www.moh.gov.cn/jkj/s3577/201009/3fa356d0f4834d408fde6c12891a6482.shtml. (in Chinese) 中华人民共和国卫生部:全国流感监测方案(2010年版)[EB/OL]. (2010-09-10)[2017-02-23]. http://www.moh.gov.cn/jkj/s3577/201009/3fa356d0f4834d408fde6c12891a6482.shtml. [29] WHO Global Influenza Surveillance Network. Manual for the laboratory diagnosis and virological surveillance of influenza[EB/OL]. (2013-09-15)[2017-02-23]. http://whqlibdoc.who.int/publications/2011/9789241548090_eng.pdf. [30] World Health Organization. WHO information for molecular diagnosis of influenza virus-update[EB/OL]. (2014-03-31)[2016-06-05]. http://www.who.int/influenza/gisrs_laboratory/molecular_diagnosis_influenza_virus_humans_update_201403.pdf?ua=1. [31] Hoffmann E, Stech J, Guan Y, et al. Universal primer set for the full-length amplification of all influenza A viruses[J]. Arch Virol, 2001, 146(12): 2275-2289. doi:10.1007/s007050170002 [32] Xu KM, Smith GJ, Bahl J, et al. The genesis and evolution of H9N2 influenza viruses in poultry from southern China, 2000 to 2005[J]. J Virol, 2007, 81(19): 10389-10401. doi:10.1128/JVI.00979-07 [33] Lu JH, Liu XF, Shao WX, et al. Phylogenetic analysis of eight genes of H9N2 subtype influenza virus: a mainland China strain possessing early isolates’ genes that have been circulating[J]. Virus Genes, 2005, 31(2): 163-169. doi:10.1007/s11262-005-1790-1 [34] Ji K, Jiang W M, Liu S, et al. Characterization of the hemagglutinin gene of subtype H9 avian influenza viruses isolated in 2007-2009 in China[J]. J Virol Methods, 2010, 163(2): 186-189. doi:10.1016/j.jviromet.2009.09.01 [35] Chu YC, Cheung CL, Hung LC, et al. Continuing evolution of H9N2 influenza viruses endemic in poultry in southern China[J]. Influenza Other Respir Viruses, 2011, 5 (Suppl 1): 68-71. [36] Peng Y, Xie ZX, Liu JB, et al. Epidemiological surveillance of low pathogenic avian influenza virus (LPAIV) from poultry in Guangxi Province, Southern China[J]. PLoS One, 2013, 8(10): e77132. doi:10.1371/journal.pone.0077132 [37] Gu M, Chen H, Li Q, et al. Enzootic genotype S of H9N2 avian influenza viruses donates internal genes to emerging zoonotic influenza viruses in China[J]. Vet Microbiol, 2014, 174(3/4): 309-315. doi:10.1016/j.vetmic.2014.09.029 [38] Stevens J, Blixt O, Tumpey TM, et al. Structure and receptor specificity of the hemagglutinin from an H5N1 influenza virus[J]. Science, 2006, 312(5772): 404-410. doi:10.1126/science.1124513 [39] Jiang W, Liu S, Hou G, et al. Chinese and global distribution of H9 subtype avian influenza viruses[J]. PLoS One, 2012, 7(12): e52671. doi:10.1371/journal.pone.0052671 [40] Vines A, Wells K, Matrosovich M, et al. The role of influenza A virus hemagglutinin residues 226 and 228 in receptor specificity and host range restriction[J]. J Virol, 1998, 72(9): 7626-7631. [41] Zhang RS, Ou X , Song KY, et al. Genetic analysis on the NS gene of H9N2 avian influenza virus isolated from sewage in poultry market[J]. Chin Prev Med, 2013, 14(03): 205-208. (in Chinese) 张如胜,欧新华,宋克云,等. 长沙市家禽市场污水来源H9N2亚型禽流感病毒NS基因进化分析[J]. 中国预防医学杂志, 2013,14(03): 205-208. [42] The SJCEIRS H9 Working Group. Assessing the fitness of distinct clades of influenza A (H9N2) viruses[J]. Emerg Microbes Infect, 2013, 2(11): e75. doi:10.1038/emi.2013.75