南昌市新型冠状病毒肺炎聚集性疫情流行病学分析

目的 对南昌市新型冠状病毒肺炎（COVID - 19）聚集性疫情流行病学特征进行描述性分析，为制定防控策略提供参考。 方法 结合流行病学调查和轨迹大数据分析，分析聚集性疫情的流行病学特征。结果 南昌市共发现聚集性疫情45起，关联病例总数176例，占南昌市报告病例总数（248例）的71.0%，主要分布在40～49岁（31.8%），职业以商业服务（27.8%）为主，确诊病例发病高峰在2020年1月25日；33起（73.3%）疫情为外地输入性疫情，12起（26.7%）为本地感染疫情；传播方式以家庭内传播和聚餐传播为主；10起（22.2%）不明原因疫情借助轨迹大数据分析发现了可能的感染来源。结论 南昌市COVID - 19病例以聚集性病例为主，疫情防控期间应控制人员聚集及流动。

Epidemiological analysis on clustering epidemics of COVID-19 in Nanchang

Objective To describe the epidemiological characteristics of clusters of COVID-19 in Nanchang, and to provide reference for prevention and control strategy. Methods Epidemiological characteristics were analyzed using epidemiological investigation and trajectory analysis based on big data. Results A total of 176 cases were associated with 45 clusters,accounting for 71.0% of the total reported cases(248 cases) in Nanchang. The cases were mainly at the age between 40 years and 49 years(31.8%) and business services(27.8%). The incidence curve showed that the incidence peak of confirmed cases occurred on 25 January, 2020. Among the 45 clusters, 33(73.3%) were imported, and 12(26.7%) were local. The main mode of transmission was family and dinner. Possible infection sources of 10(22.2%) unexplained clusters were identified through the trajectory analysis. Conclusion The cases of COVID-19 in Nanchang were mainly clustered, and the aggregation and movement of population should be controlled during the epidemics.