四川省开江县1起不明原因新型冠状病毒肺炎聚集性疫情调查分析

Investigation and Analysis of A Cluster of Cases With Unknown Origin of Novel Coronavirus Pneumonia in Kaijiang County of Sichuan Province

目的调查分析四川省开江县1起不明原因新型冠状病毒肺炎(以下简称新冠肺炎)聚集性疫情,查找传染源,为疫情防控提供科学依据。方法运用现场流行病学方法对该起聚集性疫情病例及其密切接触者进行调查,采用描述性分析方法对其流行病学调查资料和数据进行分析,标本采用实时荧光RT-PCR方法检测。结果输入性首代病例汪某与武汉返乡3人通过家庭聚餐、家庭生活等密切接触方式,在无防护措施下引起了本地家庭聚集性疫情,首代病例1例,可疑首代3例,二代病例3例;本地不明原因病例曾某与病例汪某等一行人多次在同时段经过相同道路,且均未戴口罩;病例曾某在潜伏期内通过家庭聚餐感染无症状感染者崔某。结论新冠肺炎存在家庭聚集性传播,其潜伏期存在传染性;采取有效防护可降低感染新冠肺炎的风险;需加强新冠肺炎防控知识宣传教育提高居民防护意识。

Objective To investigate and analyze a cluster of cases with unknown origin of novel coronavirus pneumonia(COVID-19)in Kaijiang county of Sichuan province so as to find the source of infection and provide a scientific basis for the prevention and control of COVID-19.Methods Investigation the cases and their close contacts by using the field epidemiological methods.Descriptive analysis methods were used to analyze the data.The COVID-19 nucleic acid was detected by real-time fluorescence quantitative RT-PCR.Results The first imported cases,Wang and 3 person who returned to their hometown from Wuhan,caused a local family cluster outbreak without protection through family dinner and life.The cluster of this case in the family includes 1 case of the first generation,3 cases of the suspected first generation,and 3 cases of the second generation.Local unknown case,Zeng have passed the same road multiple times with Wang and other cases during the same period without wearing a mask.Zeng infected asymptomatic case Cui through family dinner during the incubation period.Conclusion COVID-19 can be spread in a family cluster manner,and could be infectious during the incubation period.The effective protection can reduce the risk of COVID-19.It is necessary to strengthen the publicity and education of prevention and control of COVID-19 aiming to raise the residents’awareness of protection.