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Investigation and analysis on characteristics of a cluster of COVID-19 associated with exposure in a department store in Tianjin #MMPMID32133830
Wu WS; Li YG; Wei ZF; Zhou PH; Lyu LK; Zhang GP; Zhao Y; He HY; Li XY; Gao L; Zhang XM; Liu H; Zhou N; Guo Y; Zhang XM; Zhang D; Liu J; Zhang Y
Zhonghua Liu Xing Bing Xue Za Zhi 2020[Apr]; 41 (4): 489-493 PMID32133830show ga
Objective: To describe the epidemiological characteristics of a cluster of COVID-19 cases reported in Baodi district of Tianjin as of 18 February, 2020, which might be associated with the exposure in a local department store, and provide suggestions for prevention and control strategy development. Methods: The basic characteristics, time and area distributions, clinical manifestations, epidemiological history and transmission mode of the COVID-19 cases associated with the department store exposure were analyzed. Results: A total of 40 COVID-19 cases were associated with the department store exposure, accounting for 75.47% of the total confirmed cases (53 cases) reported in Baodi district. The cases were mainly at the age of 60 years or older (35.00%) and farmers (40.00%). The main clinical manifestations included fever (95.00%), cough (35.00%), and diarrhea (15.00%). The proportion of confirmed severe cases was 32.50%. The incidence curve showed that the incidence peak occurred on 31 January, 2020. Among the 40 cases, 6(15.00%) were department store employees, 19 (47.50%) were customers and 15 (37.50%) were close contacts (secondary cases). The first case occurred on 21 January, 2020, this case was a department store employee who had a purchasing history at whole sale markets in other provinces and cities before the onset, and 3 employees were still on duty after symptom onsets. The median of the incubation period of customer cases was 6 days, and the median of the interval between onset and medical treatment of customer cases was 7 days. Conclusion: This was a cluster epidemic of COVID-19, which might be associated with the exposure in the department store. By now, the current prevention and control measures have achieved satisfied effects.
Zhonghua+Liu+Xing+Bing+Xue+Za+Zhi 2020 ; 41 (4): 489-493
