一起新型冠状病毒肺炎聚集性疫情调查

目的分析新型冠状病毒肺炎(coronavirus disease 2019, COVID-19)聚集性疫情传播特征,为科学防控疫情提供依据。方法采用暴发调查方法现场收集淮南市某地一起聚集性疫情中病例的流行病学资料和实验室检测数据,分析聚集性疫情的感染来源和传播模式。结果本起聚集性疫情共计涉及3例无症状感染者和12例确诊病例,涉及三代病例。感染来源可能为自武汉务工返回的无症状感染者A,感染方式可能为聚餐时通过飞沫和接触传播,引起二代病例2例,三代病例10例、无症状感染者2例。结论建议加强无症状感染者的监测、发现和管控,对病例密切接触者进行集中医学观察降低传播风险。

Investigation and analysis of a family cluster of COVID-19 cases

Objective To analyze the transmission features of coronavirus disease 2019(COVID-19) cases in a family cluster, so as to provide the evidences for scientific prevention.Methods The method of outbreak investigation was used to collect the epidemiological and laboratory data in Huainan City, and analysis of infection sources and transmission patterns in clusters was made. Results In this family cluster of COVID-19 we found 3 asymptomatic cases and 12 confirmed cases. The infectious source was the asymptomatic case A who had returned from Wuhan, Hubei province. The infection was spread by droplets and intimate contact through diner or living together. There were 2 secondary generation cases and 12 third generation cases which included 2 asymptomatic cases and 10 confirmed cases. Conclusions The results suggested that we should strengthen the monitoring, detection and controlling of the asymptomatic cases, and give intensive medical observation on close contacts to reduce the risk of transmission.