Investigation on a cluster epidemic of COVID-19 with group-concealed contact history in Jingzhou City
LIU Tian1,2, TIAN Ke-qing1, LIN Mao-wen1, XIAO Lin1, SONG Kai-fa1, HAO Hai-bo1, HUANG Ji-gui1, LIAO Qiang1
1. Jingzhou Municipal Center for Disease Control and Prevention, Jingzhou, Hubei 434000, China; 2. Chinese Field Epidemiology Training Program, Beijing 100050, China
Abstract：Objective To review the investigation process of a cluster epidemic of COVID-19 with group-concealed contact history, and to summarize the survey experience. Methods Field epidemiological methods were used to investigate the COVID-19 cluster, and the investigation process was described separately according to the investigation time. Results Six confirmed cases were cumulatively reported from this cluster event, and distributed in three households of the same family. The cluster was investigated four times. Jingzhou Municipal Center for Disease Control and Prevention intervened firstly, and then community workers and police joined in the investigation. The first case had a history of travel to Wuhan before the onset. The 6 cases and family members involved in the cluster event concealed the contact history. With the help of criminal investigation technology of police, we confirmed the history of dinner with the other 5 cases after the onset of the first case. The second-generation incidence rate of close contacts was 41.67%. Conclusions The event was a cluster caused by a dinner. Joint multi-sectoral investigation is critical for the cluster epidemic with poor cooperation of surveyed subjects.
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2021, Vol. 28 
