上海市长宁区一起新型冠状病毒肺炎家庭聚集性疫情流行病学调查

Epidemiological investigation on a family cluster of COVID-19 in Changning District,Shanghai

目的分析上海市长宁区一起新型冠状病毒肺炎(简称新冠肺炎)家庭聚集性疫情流行病学特征,为新冠肺炎聚集性疫情防控提供科学依据。方法应用现场流行病学调查方法,对2020年上海市长宁区一起新冠肺炎家庭聚集性疫情的病例与密切接触者进行调查,采用实时荧光定量RT-PCR方法对采集的呼吸道标本进行新型冠状病毒核酸检测。结果病例A为本起家庭聚集性疫情的感染来源,共传染二代病例5人。病例A通过呼吸道飞沫传播及密切接触传播给病例B、病例C、病例D和病例E,通过呼吸道飞沫传播给病例F。除咳嗽、乏力和其它呼吸道症状,病例F还出现消化道症状。本起家庭聚集性疫情涉及一例无症状感染者。结论新冠肺炎容易造成家庭聚集性疫情的发生;应加强对病例密切接触者的追踪和管理,尽早识别二代病例。

Objective To analyze the epidemiological characteristics of a family cluster of COVID-19 in Changning District,Shanghai,and to provide a scientific basis for prevention and control of cluster epidemic of COVID-19.Methods Field epidemiological methods were used to survey the cases and close contacts in a family cluster of COVID-19 in Changning District,Shanghai in 2020.Real-time fluorescence quantitative RT-PCR was applied to detecting 2019-n Co V nucleic acid in the collected respiratory tract samples.Results Case A was the source of infection in this family cluster epidemic.There were 5 second-generation cases infected in the whole incubation period.Routes of transmission showed that cases B,C,D and E were transmitted by case A through droplets and close contacts,and case F was transmitted by case A through droplets alone.Besides cough,fatigue and other respiratory symptoms,there were also gastrointestinal symptoms in case F.An asymptomatic COVID-19 carrier was involved in this family cluster.Conclusions COVID-19 spreads easily in family.We should strengthen the tracking and management of close contacts of COVID-19 cases,and identify the second-generation cases as early as possible.