山东省胶州市一起新冠肺炎聚集性疫情调查分析

Investigation and analysis on a cluster of COVID-19, Jiaozhou city, Shandong province

目的分析2022年山东省胶州市一起新型冠状病毒肺炎(以下简称新冠肺炎)聚集性疫情的流行病学特征,为防控新冠肺炎疫情提供参考。方法应用现场流行病学调查方法,对2022年山东省胶州市一起新冠肺炎聚集性疫情的来源、发生及传播过程进行分析,采用实时荧光定量RT0-PCR法对采集的呼吸道样本进行新型冠状病毒核酸检测。结果本起聚集性疫情的感染来源0号病例由高风险地区来胶州市,共传染一代病例6人。随后其中5人作为家庭引入病例又传染家人和朋友,产生了二代病例14人,家庭内密切接触者感染率为68.75%(11/16)。4名家庭引入病例为无症状感染者,9名二代病例是在一代病例发病前1~3 d有接触史,潜伏期中位数为4.1 d(2~8 d)。结论新冠肺炎容易造成家庭聚集性疫情的发生,家庭内密切接触者感染率较高;有效防控家庭聚集性疫情,对防止进一步传播有重要意义。

Objective To analyze the epidemiological characteristics of a cluster of COVID-19 in Jiaozhou city,Shandong province,so as to provide a reference for prevention and control of COVID-19.Methods Field epidemiological method was used to analyze the source,occurrence and transmission process of the cluster of COVID-19 in Jiaozhou city,Shandong province.Real-time fluorescence PCR(RT-PRC)assay was applied to detect 2019-nCoV nucleic acid in the collected respiratory tract samples.Results Case 0 from high-risk area was the source of infection in this cluster epidemic,and there were 6 first-generation cases.Then 5 first-generation cases as the family index cases infected their families and friends,resulting in 14 second-generation cases,and the infection rate of close contacts within the family was 68.75%(11/16).There were 4 family index asymptomatic cases,and 9 second-generation cases had contact history 1-3 days before the first-generation cases.The median incubation period was 4.1 days(2-8 days).Conclusion COVID-19 is easy to cause family aggregation epidemic,and the infection rate of close contacts within the family is higher.Effective prevention and control of family cluster epidemic is of great significance to prevent further spread of COVID-19.