西安市一起新型冠状病毒肺炎家族聚集性疫情调查分析

目的 调查分析西安市一起新型冠状病毒肺炎(COVID-19)家族聚集性疫情传播特征,为制定防控策略提供科学依据。 方法 对COVID-19确诊病例、无症状感染者及密切接触者进行流行病学调查,分析疫情的传播链,采集病例及相关人员的鼻咽拭子标本进行SARS-CoV-2核酸检测。 结果 本次疫情累计发现4例普通型、1例危重症型确诊病例和2例无症状感染者,危重症病例最终死亡。首例病例A于2020年1月31日发病,其他病例在首例病例发病后的1~13 d内发病,病例B、C和D、E分别为二、三、四代病例。 结论 家族聚集性疫情是COVID-19的防控重点,及早发现传染源,对密切接触者进行筛查隔离,防止传播扩散有重要意义。

Investigation of a family cluster outbreak of coronavirus disease 2019 in Xian

Objective To investigate the transmission characteristics of a family cluster outbreak of coronavirus disease 2019(COVID-19)in Xian, in order to provide reference for prevention and control efforts. Methods Epidemiological investigations on the confirmed cases, asymptomatic carriers and their close contacts were carried out, the transmission chain was analyzed, and the pharyngeal swabs for nucleic acid tests of SARS-CoV-2 were collected. Results A total of 4 mild cases, 1 severe case and 2 asymptomatic carriers were tracked. The severe case finally died. The first case(A)had onset on Jan. 31, 2020, and the other cases(B, C as well as D, E)had onset 1-13 days later, who were second, third, and fourth generation cases. Conclusion The prevention and control of COVID-19 should focus on family cluster outbreak. Early detection of the source of infection and screening and isolation of close contacts are important to prevent the spread of the epidemic.