1995～1997年中国部分地区麻疹病毒流行株基因型分析

Geneotic Analysis of Wild Type Measles Viruses Circulating in China During 1995-1997

本文报道以反转录二步多聚酶链反应方法 (RT -PCR)直接测定麻疹病人唾液、尿液标本中的麻疹病毒 (MV)血凝基因 (H)、核衣壳基因 (N)。以RT -PCR产物纯化后进行MV 4 50ntH、2 82ntN基因核苷酸片段测序分析 ,测序结果一致表明 ,1995～ 1997年期间中国部分地区MV流行株存在两种基因型。其中一种基因型只发现 1株 ,与EDw54株相同 ,另一种基因型占流行株的绝大多数 (称新基因型 ) ,与其它国家以前报道的MV流行株基因型的N基因最大差异为 15.4 %与EDw54、疫苗株相差8.8% ;H基因最大差异是 10 .8%。

To investigate the molecular epidemiology of measles virus (MV) in China, sequence analysis of MV was performed based on a 282-nt region of the nucleoprotein (N) gene and a 450-nt region of heamaglutinin (H) gene by direct sequencing of RT-PCR amplicons obtained from clinical specimens. Results revealed that one MV strain belonged to ED-like genotype and remainder strains were clustered into a new genotype which was distinct from Chinese vaccine strains and MV strains circulating in other countries, as previously described representing a new genotype. There was up to 15.4% divergence in the nt-282 N gene and 10.8% divergence in the nt-450 H gene between the new genotype and other genotypes.