摘要目的 了解浙江省义乌市HIV亚型分布和传播簇特征,为HIV流行趋势分析和疫情防治提供依据.方法 对该地区2016年新报告HIV/AIDS开展分子流行病学横断面研究,从168例血浆中提取RNA,通过RT-PCR和巢式PCR扩增pol基因并测序.构建系统进化树分析亚型和传播簇,通过CPR 6.0在线软件工具分析耐药突变位点.结果 研究对象年龄(39.1±13.4)岁,男性为主(86.3％,145/168),外省户籍居多(66.7％,112/168),感染途径为同性传播(51.2％,86/168)和异性传播(48.8％,82/168).HIV序列成功获得率为89.9％(151/168),优势亚型为CRF01_AE 74例(49.0％)和CRF07 BC 64例(42.4％),其他亚型包括CRF08_BC 5例(3.3％),CRF55_01B 3例(2.0％),B、CRF45_cpx、CRF59_01B、CRF85 BC和URF(B/C)各1例.CRF45_cpx和CRF85_BC在浙江省首次发现.共发现26个传播簇(含65个病例),总成簇比例43.0％(65/151),CRF01_AE成簇比例54.1％ (40/74),高于CRF07 BC的32.8％ (21/64);各传播簇平均大小为2.5例/簇,CRF01 AE中异性传播的传播簇最大(3.5例/簇).传播性耐药率为4.6％(7/151),7例检出监测性耐药突变,包括M46L 5例,F77L和Y181C各l例.结论 义乌市HIV亚型复杂多样,多种传播簇并存且特征多样,应继续加强亚型监测,重点对传播簇病例开展专题调查,实施针对性有效干预.

abstractsObjective To understand the characteristics of distribution on HIV-1 subtypes and the transmission clusters in Yiwu in Zhejiang province.Methods A cross-sectional study of molecular epidemiology was carried out on newly reported H1V/AIDS cases in Yiwu.RNA was extracted from 168 plasma samples,followed by RT-PCR and nest-PCR for pol gene amplification,sequencing,phylogenetic tree construction used for analyzing the subtypes and transmission clusters.Mutations on drug resistance was analyzed by CPR 6.0 online tool.Results Subjects were mainly males (86.3％,145/168),with average age as (39.1 ± 13.4) years old and most of them were migrants (66.7％,112/168).The major routes of transmission included homosexual (51.2％,86/168) and heterosexual (48.8％,82/168) contacts.The rate of success for sequence acquisition was 89.9％ (151/168).The dominant subtypes showed as CRF01_AE (74,49.0％) and CRF07_BC (64,42.4％),followed by CRF08_BC (5,3.3％),CRF55_01B (3,2.0％),each case of subtype B,CRF45_cpx,CRF59_01B,CRF85_BC and URF (B/C).CRF45_cpx and CRF85_BC were discovered the first time in Zhejiang province.Twenty-six transmission clusters involving 65 cases were found,with the total clustered rate as 43.0％ (65/151),in which the CRF01_AE clustered rate appeared as 54.1％ (40/74),higher than that of CRF07_BC (21/64,32.8％).The average size of cluster was 2.5 cases/cluster,with average size of cluster in CRF01_AE patients infected through heterosexual transmission as the largest (3.5 cases/cluster).The prevalence of transmitted drug resistance was 4.6％ (7/151).Seven cases with surveillance drug resistant mutations (SDRM) were found,including 5 cases of M46L (3.3％),and one case of F77L or Y181C.Conclusion HIV genetic diversity and a variety of transmission clusters had been noticed in this study area (Yiwu).Programs on monitoring the subtypes and transmission clusters should be continued and strengthened.