摘要
2002～2004年浙江省发生了无菌性脑膜炎暴发疫情,为了及时查明病因,分析病原的分子特征并进行病原溯源,我们采集患者脑脊液和粪便样本271份,用RD和Hep-2细胞同时分离病毒,对分离株VP1和VP4/VP2基因测序,进行同源性与进化分析。结果从271份样本中分离到埃柯病毒30型(E30)78株;对31株分离株VP1区核苷酸(nt)序列测定,其长度均为876nt,推导编码292个氨基酸(aa)。浙江E30株与原型株Bastianni在VP1区的nt和aa同源性分别为84.7%～86.3%和92.1%～94.2%;浙江E30株之间nt和aa的同源性分别为87.1%～99.4%和96.2%～100%。在VP1基因进化树上浙江E30株分别位于G和H基因亚型分支上,与浙江E30G亚型株亲缘关系最近的国内外毒株分别为2003年江苏、山东株和1999年乌克兰株;与浙江E30H亚型株亲缘关系最近的毒株为2008年韩国株。VP4/VP2区同源性与进化分析结果与VP1相似。结果表明2002～2004年浙江省无菌性脑膜炎暴发疫情由E30G和H二类不同基因亚型流行株引起;H基因亚型株推测为新的E30变异株,首先分离于2002年浙江省。
In order to confirm the cause of the outbreak of aseptic meningitis in Zhejiang Province in 2002- 2004, trace the pathogen and analyze the molecular characteristics, 271 cerebrospinal fluid （CSF） and faeces specimens were collected from suspected patients. The virus strains from the specimens were isolated with RD and Hep-2 cell lines. The VP1 and VP4/VP2 genes of the isolated viruses were sequenced, and their phylogenetic and homology trees were also constructed. Of the total 271 samples, 78 Echovirus type 30 （E30） strains were isolated. All of the complete VP1 genes in 31 sequenced virus isolates of E30 were composed of 876 nt without any insertion or deletion, encoding 292 amino acids （aa）. The identity of nucleotide and amino acid in VP1 gene were 84. 7% -86.3% and 92.1% -94. 2% between the 31 Zhejiang strains and the prototype strain Bastianni of E30, and 87.1%-99.4% and 96.2%-100% among the 31 Zhejiang strains, respectively. The Zhejiang strains of E30 in the phylogenetic tree of the VP1 gene were attributed into two branches of the G and H genotype, respectively. In G genotype, the Shangdong and Jiangsu E30 strains in 2003 among domestic strains and Ukraine E30 strain in 1999 among overseas strains had maximum similarity with the Zhejiang strains, while H genotype had maximum similarity with the Korea E30 strains in 2008. The phylogenetic tree of the VP4/VP2 genes was similar to that of VP1 gene. The results indicated that the outbreak of aseptic meningitis in Zhejiang Provinec in 2002-2004 was caused by the G and H genotypes of E30 strains existing simultaneously. The H genotype was a new variant strain, which was first isolated in Zhejiang Province in 2002.
出处
《病毒学报》
CAS
CSCD
北大核心
2011年第5期462-468,共7页
Chinese Journal of Virology
基金
国家科技重大专项<浙江及周边省传染病病原谱流行规律研究>课题(2009ZX10004-210)
