新型冠状病毒核酸检测混采阳性样本的溯源检测和分析
Capital Journal of Public Health（2023）
北京市疾病预防控制中心
Abstract
目的 对某新型冠状病毒(以下简称新冠病毒)核酸检测阳性的混采鼻咽拭子样本进行溯源检测和分析,为新型冠状病毒感染(以下简称新冠感染)疫情大规模核酸筛查混采阳性样本的溯源提供参考.方法 用实时荧光RT-PCR方法对某一批次混采A+B组2合1鼻咽拭子新冠病毒核酸阳性样本及同批次复核C、D单管鼻咽拭子新冠病毒核酸阳性样本进行复测,并对混采A+B组阳性样本进行污染鉴定、突变株检测和全基因组测序实验.将测序结果与同批次检出的C、D单管阳性样本序列进行比对分析.结果 A+B组混采及单管C、D单管样本复测均阳性;A+B混采样本排除DNA污染;A+B混采样本及C、D单管阳性样本中新冠病毒均为德尔塔变异株类似株(B.1.617.2突变株),全基因组序列一致性为100％,这三件阳性样本的病毒来源一致.结论 新冠感染疫情大规模人群核酸筛查出现混采阳性而复核单管阴性时,需利用多种实验方法对混采阳性和其他相关样本检测,结合流调资料进行溯源分析,降低感染病例漏检率.
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