中国人兽共患病学报2017，Vol.33Issue(3)：212-221,10.DOI:10.3969/j.issn.1002-2694.2017.03.005
2014年长沙市禽类场所环境H9N2亚型禽流感病毒分子流行特征分析
Molecular epidemiological characteristics of avian influenza A(H9N2) viruses from environment in poultry markets in Changsha, China, 2014
摘要
Abstract
We analyzed the evolutional and molecular characteristics of Hemagglutinin(HA),Neuraminidase(NA) and nonstructural(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 RTPCR 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.关键词
禽类场所/环境/禽流感病毒/H9N2亚型/基因/进化分析Key words
poultry markets/environment/avian influenza virus/H9N2 subtype/gene/phylogenetic analysis分类
医药卫生引用本文复制引用
张如胜,姚栋,叶文,陈静芳,黄政,刘晓蕾,陈田木,欧新华,孙边成..2014年长沙市禽类场所环境H9N2亚型禽流感病毒分子流行特征分析[J].中国人兽共患病学报,2017,33(3):212-221,10.基金项目
湖南省卫生计生委2015年度科研计划项目(No.B2015-153) （No.B2015-153）
Supported by the Hunan Provincial Health Medicine Research Project (No.B2015-153) （No.B2015-153）
