淄博市一起新型冠状病毒肺炎家族聚集性疫情调查分析

Investigation and analysis of the characteristics of a family cluster of coronavirus disease 2019 in Zibo

目的对淄博市一起新型冠状病毒肺炎聚集性疫情进行调查,分析聚集性疫情的流行病学特征。方法应用现场流行病学方法调查聚集性疫情中的病例及密切接触者,采用描述性流行病学方法对调查资料进行统计分析。结果本次疫情首发病例发病时间2020年1月10日,为杭州务工返乡人员,最后1例病例发病时间为2020年2月14日。共波及244人,发现14例确诊病例和2例无症状感染者,其中男11例,女5例,23~84岁,年龄中位数为50岁,罹患率为6.56%(16/244)。疫情波及2个区县,4个乡镇,4个村居,8个家庭。潜伏期最长为10 d,最短为3 d,中位数4 d。采取集中隔离措施前发病11例,其中9例在小诊所就诊或自行服药。从发病到确诊中位数15 d,最长31 d,本次疫情共发生3~4代传播。结论此次疫情是由新型冠状病毒输入病例,未及时就诊,通过家族成员春节期间相互拜年,多次暴露引起的家族性聚集性疫情,提示应加强农村地区传染病防控工作,充分发挥社区、村居对重点人群健康监测和管理职能。

Objective To investigate a family cluster of coronavirus disease 2019(COVID-19)in Zibo,so as to analyze the characteristics of the epidemic.Methods The cases and close contacts were investigated with field epidemiological method,and the data collected were analyzed with descriptive epidemiological method.Results The first case had onset on Jan.10,2020,who was a migrant worker returning home from Hangzhou.The last case had onset on Feb.14.A total of 244 people were involved,among whom 14 were confirmed and 2 were asymptomatic carriers,including 11 males and 5 females,aged 23 to 84 years(median 50).The incidence was 6.56%(16/244).The epidemic affected 2 districts,4 towns,4 villages and 8 families.The maximum incubation period was 10 days,the minimum was 3 days,and the median was 4 days.Before centralized isolation measures were taken,11 people had onset,9 of whom sought treatment in small clinics or took medicine by themselves.The median from onset to diagnosis was 15 days,and the longest time was 31 days.The epidemic had 3-4 generations of transmission.Conclusion This family cluster was caused by an imported case untreated in time who visited family members and relatives during the Spring Festival,indicating that the prevention and control of infectious diseases in rural areas should be strengthened.The function of health monitoring and management of key groups in communities and villages should be given full play.