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| Epidemiological investigation of a cluster of COVID-19 in badminton venues |
| XIANG Zelin1, FU Xiaofei1, QI Yunpeng1, ZHU Guoying1, GU Weiling1, HU Jie1, LI Fudong2, ZHOU Wanling1, HOU Zhigang1, LIU Yang1, LIU Yanqing1, GUO Feifei1, LU Xianquan3, GUO Linjie3, CHEN Zhongwen1
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1. Department of Communicable Disease Control and Prevention, Jiaxing Center for Disease Control and Prevention, Jiaxing, Zhejiang 314050, China;
2. Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou, Zhejiang 310057, China;
3. Pinghu Center for Disease Control and Prevention, Pinghu, Zhejiang 314200, China |
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Abstract Objective To perform an epidemiological survey of the first case with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection in Pinghu City of Jiaxing City, Zhejiang Province on March 13, 2022, so as to provide insights into the management of coronavirus disease (COVID-19) epidemics. Methods According to the requirements of the Protocol on Prevention and Control of COVID-19 (8th Edition), epidemiological investigations were performed among 39 cases with SARS-CoV-2 infections in Pinghu City from March 13 to 20, 2022. Cases' demographics, clinical symptoms, history of immunization and exposure were collected, and close contacts were identified. Pharyngeal swabs were sampled from infected cases for detection of SARS-CoV-2 nucleic acid and whole-genome sequencing, and the source of infection and transmission route were investigated. Results The index case for this COVID-19 epidemic was an imported case from Shanghai Municipality, who infected 6 persons via aerosol transmission when playing in the badminton venue of Pinghu National Fitness Center on March 9; subsequently, one of these infected cases infected another 18 persons when playing in the badminton venue of Jiadian Village Resident's Fitness Center in Zhapu Township on March 12. Sixteen confirmed cases were reported, and all cases were mild; another 23 asymptomatic cases were diagnosed, with no death reported. This epidemic occurred from March 11 to 20, with 3 generations of spread and a median incubation period of 3 days. The SARS-CoV-2 infected cases had a median age of 33.5 (interquartile range, 12.0) years and included 36 cases with a history of COVID-19 vaccination. There were 16 cases with fever, cough, runny nose and sore throat, and 13 cases with imaging features of pneumonia. The effective reproductive number (Rt) of the COVID-19 epidemic was 7.73 at early stage, and was less than 1 since March 21. Whole-genome sequencing identified Omicron BA.2 variant among 33 cases, which had high homology with the index cases. Conclusion This epidemic was a cluster of COVID-19 caused by imported Omicron BA.2 variant infection from Shanghai Municipality, and the COVID-19 transmission was mainly caused by indoor aerosols.
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Received: 16 September 2022
Revised: 28 February 2023
Published: 17 April 2023
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[1] World Health Organization.WHO Director-General's opening remarks at the media breifing on COVID-19 11 March 2020[EB/OL].[2023-02-28]. https://www.who.int/dg/speeches/detail/who-director-general-s-opening-remarks-at-the-mediabriefing-on-covid-19---11-march-2020.
[2] CHEN J H,WEI G W.Omicron BA.2(B.1.1.529.2):high potential for becoming the next dominant variant[J].J Phys Chem Lett,2022,13(17):3840-3849.
[3] 倪晓媚,柯珍,季小微,等.青田县一起境外输入新型冠状病毒肺炎聚集性疫情分析[J].预防医学,2020,32(7):678-681.
[4] 李辉,段东辉,陈冰冰,等.宁波市一起新型冠状病毒肺炎家庭聚集性疫情调查[J].预防医学,2020,32(9):895-898.
[5] 中华人民共和国国务院应对新型冠状病毒肺炎疫情联防联控机制综合组.关于印发新型冠状病毒肺炎防控方案(第八版)的通知[EB/OL].[2023-02-28].http://www.nhc.gov.cn/xcs/zhengcwj/202105/6f1e8ec6c4a540d99fafef52fc86d0f8.shtml.
[6] 中华人民共和国国家卫生健康委员会.新型冠状病毒肺炎诊疗方案(试行第九版)[EB/OL].[2023-02-28].http://www.nhc.gov.cn/yzygj/s7653p/202203/b74ade1ba4494583805a3d 2e40093d88.shtml.
[7] 张晓宝,严丹莹,陈灿.传染病流行病学中基本再生数与有效再生数指标的研究进展[J].中华疾病控制杂志,2021,25(7):753-757.
[8] 高雅,姜文婕,姚利利,等.上海市宝山区新型冠状病毒肺炎病例密切接触者感染危险因素分析[J].实用预防医学,2022,29(4):399-401.
[9] 洪浚扉,李羽敏,季巧英,等.丽水市新型冠状病毒肺炎聚集性疫情分析[J].预防医学,2020,32(12):1217-1219. |
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