摘要
目的：了解柯萨奇A6型肠道病毒（ CVA6）在广东省的流行特点及其基因特征。方法对2008-2013年收集的手足口病非肠道病毒71型（ EV71）非CVA16肠道病毒阳性标本进行CVA6荧光定量PCR检测，选取 CVA6阳性标本进行 VP1全长序列扩增与测序，运用 DNAStar6．0和MEGA5．2软件对获取序列与从 GenBank 下载的 CVA6 VP1全长序列进行遗传进化分析。结果2008-2013年广东省手足口病非 EV71非 CVA16肠道病毒阳性标本中 CVA6占61．4％（1026/1672），每年分别占10．5％（4/38）、66．7％（34/51）、36．2％（81/224）、63．0％（182/289）、62．3％（325/522）和73．0％（400/548），CVA6在2008-2013年各年份非EV71非CVA16肠道病毒中的构成比差异有统计学意义（χ2＝133．79， P＜0．01）；CVA6在系统进化树中形成4个分支，各分支核苷酸差异为15．5％～23．1％，可分为A、B、C、D等4个基因群，D基因群可分为D1～D3等3个基因亚群；2008-2013年广东省CVA6流行株的核苷酸和氨基酸同源性分别为88．7％～100．0％和95．7％～100．0％，存在D2和D3亚群的流行，其中D2亚群流行于2008-2012年，D3亚群流行于2009-2013年。结论2008-2013年广东省手足口病非EV71非CVA16肠道病毒以CVA6为主。基于VP1序列分析，CVA6可分为A、B、C、D等4个基因群，D基因群的D2和D3亚群在广东省存在流行，其中D3亚群是优势流行株。
Objective To study the epidemic and genetic characteristics of coxsackievirus A6 （ CVA6） strains isolated in Guangdong province.Methods Enterovirus strains positive for neither entero-virus A71 （ EV71） nor CVA16 were isolated from Guangdong province during 2008 to 2013 to screen CVA6 isolates by real-time PCR.The entire sequences of viral genes encoding VP1 of CVA6 positive samples were amplified and sequenced.The phylogenetic analysis was performed to analyze the full-length gene sequences encoding VP1 of CVA6 isolates and sequences downloaded from GenBank by using DNAStar6.0 and MEGA5.2 software packages.Results CVA6 strains accounted for 61.4%of the 1672 non-EV71 and non-CVA16 enterovirus strains isolated in Guangdong province during year 2008 to 2013.The positive rates were respectively 10.5%（4/38）, 66.7%（34/51）, 36.2% （81/224）, 63.0% （182/289）, 62.3% （325/522） and 73.0%（400/548） from 2008 to 2013 and the differences among different years were significant （χ2=133.79, P〈0.01）.The CVA6 isolates could be classified into four clusters in the phylogenetic tree, designated A, B, C and D （including D1, D2 and D3 subgenogroups） genogroups.The four clusters shared nucleotide diversity ranging from 15.5% to 23.1%.The CVA6 strains isolated in Guangdong province shared 88.7%-100.0% homologies in nucleotide and 95.7%-100.0% in amino acid.Subtype D2 strains circulated during 2008 to 2012 and subtype D3 strains circulated during 2009 to 2013.Conclusion CVA6 strains were the predominant enterovirus strains among non-EV71 and non-CVA16 enterovirus strains circula-ted in Guangdong province from year 2008 to 2013.The CVA6 isolates could be classified into A, B, C and D genogroups based on the sequence analysis of VP1 region.Subgroups D2 and D3 isolates were identified and the subgroup D3 isolates were the prevalent strains in Guangdong.
出处
《中华微生物学和免疫学杂志》
CAS
CSCD
北大核心
2014年第10期742-746,共5页
Chinese Journal of Microbiology and Immunology
基金
广东省医学科研基金项目
