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| Characteristics of COVID-19 clusters in Lishui |
| HONG Junfei*, LI Yumin, JI Qiaoying, CHEN Rongfu, WU Zhenyu, TAO Tao, DONG Shengcao, LIU Shangwei, YE Xianming
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| *Lishui Center for Disease Control and Prevention, Lishui, Zhejiang 323000, China |
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Abstract Objective To analyze the epidemiological characteristics of coronavirus disease 2019 ( COVID-19 ) clusters in Lishui, so as to provide basis for the prevention and control of COVID-19 clusters. Methods The data of COVID-19 clusters in Lishui from January 23 to March 29, 2020 were collected through China Disease Control and Prevention Information System-Public Health Emergency Information System, and analyzed time, space, scale, source of infection, exposure and transmission route by descriptive epidemiological method. Results There were 31 cases in 8 clusters ( about 4 cases per cluster ), with no death. The report time was bimodal, peaked first from January 20 to February 10 with 4 clusters imported from domestic and peaked second from March 1 to 29 with 4 clusters imported from overseas. Qingtian County reported 4 clusters, Liandu District, Yunhe County, Qingyuan County and Jingning County each reported 1 cluster. Thirteen cases were restaurant employees, accounting for 41.94%. The cases were mainly occurred in the condition that exposed in the same family ( 6 clusters ), in the same dinner and car ( 1 clusters ), and in the same party ( 1 clusters ). The exposure modes that caused more cases infected were through the same family (9 cases) and through the same dinner and car ( 6 cases ). There were 3 clusters with first-generation cases, 3 clusters with second-generation cases and 2 clusters with third-generation cases. The recurrence rate of the 8 clusters ranged from 1.49% to 7.69%, with a median of 3.47%. Conclusions The COVID-19 clusters in Lishui imported from domestic in the early stage and later from overseas. Most cases were reported from Qingtian County, were engaged in catering business, and exposed by living with families.
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Received: 08 June 2020
Revised: 01 September 2020
Published: 10 December 2020
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