| 李东,杨秀惠,张苏晗,潘伟毅,周勇,陈致飞,吴瑞红.福建省发现输入性B3基因型麻疹病毒[J].中华流行病学杂志,2020,41(6):946-951 |
| 福建省发现输入性B3基因型麻疹病毒 |
| Imported B3 genotype measles virus isolated in Fujian province |
| 收稿日期:2019-08-15 出版日期:2020-06-16 |
| DOI：10.3760/cma.j.cn112338-20190815-00599 |
| 中文关键词: 麻疹病毒 B3基因型 病毒学监测 |
| 英文关键词: Measles virus B3 genotype Molecular virology |
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| 中文摘要: |
| 目的 分析福建省2018年输入性B3基因型麻疹病毒的病原学特征。方法 采用实时荧光定量RT-PCR筛查和扩增麻疹病毒核酸阳性咽拭子及Vero/Slam细胞培养阳性产物。对麻疹病毒N基因羧基末端634个核苷酸片段进行扩增测序，比对分析构建基因亲缘性关系树。结果 分离获得2株麻疹病毒株，18条病毒核酸序列。所有福建株在亲缘关系上与WHO B3基因型参考株同属一个分支，其中标本MV18-41和MV18-42与2018年分离于中国香港地区的毒株（HongKong.CHN/35.18）核酸同源性为100.0%；其他毒株序列与2018年分离于日本的毒株（Mvs/Osaka.JPN/38.18/B3）同源性最高（99.9%）。福建株与除B3基因型外，23种WHO不同麻疹基因型参考株之间比较，福建株与B1基因型参考株核苷酸和氨基酸同源差异性最小，分别为95.1%～95.4%和95.3%；与H1基因型参考株同源差异性最大，其中与中国目前优势流行的参考株MVi/Hunan.CHN/0.93/7核苷酸和氨基酸同源差异分别为88.7%～89.0%和87.3%；在病毒N蛋白羧基末端150个氨基酸位点上，福建株与疫苗株（Shanghai-191）之间存在13个变异位点，但这些位点并未引起该蛋白区域的功能变化。结论 福建省成功分离获得2株B3基因型麻疹毒株，B3基因型麻疹病毒是福建省发现的新基因型麻疹病毒，在补充和丰富福建省麻疹病毒分子流行病学本底资料的同时也进一步警示必需加强输入性病例的监测，才能更好地完成福建省麻疹病毒的控制和消除工作。 |
| 英文摘要: |
| Objective We isolated and identified the genotypes and molecular characteristics of the imported B3 measles virus (MeV) in Fujian province in 2018. Methods Throat swab specimens were collected from clinically diagnosed measles patients and tested for viral RNA, using the real-time reverse transcription-polymerase chain reaction after the RNA extraction. Reverse transcription-polymerase chain reaction method was undertaken to amplify the 634 nucleotide acids of 3-terminal of the nucleoprotein gene. A phylogenetic tree was constructed and similarities in homology assessed. Results We successfully isolated and obtained two measles virus strains and eighteen viral nucleic acid sequences. The Fujian strains were clustered within the same genotype group of WHO genotype B3 reference strains. Compared to the major circulating measles strain genotype B3 in the world, two Fujian strains MV18-41 and MV18-42 showed 100.0% nucleic acid homology to HongKong.CHN/35.18 strain which was isolated from Hong Kong in 2018. The remaining 16 Fujian strains showed the highest homology (99.9%) with the Mvs/Osaka.JPN/38.18/B3 strain isolated from Japan in 2018. Compared with other 23 WHO genotype reference strains, homology on both nucleotide and amino acid of the Fujian strain and the B1 genotype reference strain were the smallest, as 95.1%-95.4% and 95.3%, respectively. The differences of homology between the Fujian strain and H1 genotype reference strain were the largest, as 88.7%-89.0% and 87.3%, respectively. In addition, there were 13 mutation sites between the Fujian strain and the vaccine strain (Shanghai-191) at the 150 amino acid position of carboxy terminus on N protein, However, these sites did not cause functional changes in the protein region. Conclusions In Fujian province, two strains of B3 genotype measles virus were obtained successfully, which were considered to be new genotype measles virus found in 2018. These findings showed it is necessary to strengthening the monitoring program on imported cases for better control and eliminate the measles virus. |
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