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[Investigation of a cluster epidemic of COVID-19 in Ningbo].
Zhonghua Liu Xing Bing Xue Za Zhi. 2020 Dec 10; 41(12):2029-2033.ZL

Abstract

Objective: To investigate a cluster epidemic of COVID-19 after a mass gathering activity in Ningbo of Zhejiang province and analyze the transmission chain and status of infection cases of different generations. Methods: The tracking of all the close contacts of the first COVID-19 case and epidemiological investigation were conducted on January 29, 2020 after a cluster epidemic of COVID-19 related with a Buddhism rally on January 19 (the 1.19 rally) in Ningbo occurred. The swabs of nose/throat of the cases and close contacts were collected and tested for nucleic acids by real-time fluorescence quantitative RT-PCR. Results: From January 26 to February 20, 2020, a total of 67 COVID-19 cases and 15 asymptomatic infection cases related with the 1.19 rally were reported in Ningbo. The initial case was the infection source who infected 29 second generation cases and 4 asymptomatic infection cases, in whom 23 second generation cases and 3 asymptomatic infection cases once took bus with the initial case, the attack rate was 33.82% (23/68) and the infection rate was 38.24% (26/68). The risks of suffering from COVID-19 and being infected were 28.91 times and 26.01 times higher in rally participants taking bus with initial case compared with those taking no bus with initial case. In this epidemic, 37 third+generation cases and 11 related asymptomatic infection cases occurred, the attack rate was 2.88% (37/1 283) and the infection rate was 4.76% (48/1 008). The main transmission routes included vehicle sharing and family transmission. Conclusion: It was a cluster epidemic of COVID-19 caused by a super spreader in a massive rally. The epidemic has been under effective control.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Ye LX
Ningbo Prefectural Center for Disease Control and Prevention, Ningbo 315010, China.
Wang HB
Ningbo Haishu Distract Center for Disease Control and Prevention, Ningbo 315010.
Lu HC
Ningbo Yinzhou Distract Center for Disease Control and Prevention, Ningbo 315120, China.
Chen BB
Ningbo Haishu Distract Center for Disease Control and Prevention, Ningbo 315010.
Zhu YY
Ningbo Prefectural Center for Disease Control and Prevention, Ningbo 315010, China.
Gu SH
Ningbo Prefectural Center for Disease Control and Prevention, Ningbo 315010, China.
Wang JM
Ningbo Prefectural Center for Disease Control and Prevention, Ningbo 315010, China.
Pan XX
Ningbo Prefectural Center for Disease Control and Prevention, Ningbo 315010, China.
Fang T
Ningbo Prefectural Center for Disease Control and Prevention, Ningbo 315010, China.
Dong HJ
Ningbo Prefectural Center for Disease Control and Prevention, Ningbo 315010, China.

MeSH

COVID-19ChinaEpidemicsHumansIncidenceSARS-CoV-2

Pub Type(s)

Journal Article

Language

chi

PubMed ID

32397698

Citation

Ye, L X., et al. "[Investigation of a Cluster Epidemic of COVID-19 in Ningbo]." Zhonghua Liu Xing Bing Xue Za Zhi = Zhonghua Liuxingbingxue Zazhi, vol. 41, no. 12, 2020, pp. 2029-2033.
Ye LX, Wang HB, Lu HC, et al. [Investigation of a cluster epidemic of COVID-19 in Ningbo]. Zhonghua Liu Xing Bing Xue Za Zhi. 2020;41(12):2029-2033.
Ye, L. X., Wang, H. B., Lu, H. C., Chen, B. B., Zhu, Y. Y., Gu, S. H., Wang, J. M., Pan, X. X., Fang, T., & Dong, H. J. (2020). [Investigation of a cluster epidemic of COVID-19 in Ningbo]. Zhonghua Liu Xing Bing Xue Za Zhi = Zhonghua Liuxingbingxue Zazhi, 41(12), 2029-2033. https://doi.org/10.3760/cma.j.cn112338-20200316-00362
Ye LX, et al. [Investigation of a Cluster Epidemic of COVID-19 in Ningbo]. Zhonghua Liu Xing Bing Xue Za Zhi. 2020 Dec 10;41(12):2029-2033. PubMed PMID: 32397698.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - [Investigation of a cluster epidemic of COVID-19 in Ningbo]. AU - Ye,L X, AU - Wang,H B, AU - Lu,H C, AU - Chen,B B, AU - Zhu,Y Y, AU - Gu,S H, AU - Wang,J M, AU - Pan,X X, AU - Fang,T, AU - Dong,H J, PY - 2020/5/14/pubmed PY - 2021/1/13/medline PY - 2020/5/14/entrez KW - COVID-19 KW - Close contact KW - Cluster SP - 2029 EP - 2033 JF - Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi JO - Zhonghua Liu Xing Bing Xue Za Zhi VL - 41 IS - 12 N2 - Objective: To investigate a cluster epidemic of COVID-19 after a mass gathering activity in Ningbo of Zhejiang province and analyze the transmission chain and status of infection cases of different generations. Methods: The tracking of all the close contacts of the first COVID-19 case and epidemiological investigation were conducted on January 29, 2020 after a cluster epidemic of COVID-19 related with a Buddhism rally on January 19 (the 1.19 rally) in Ningbo occurred. The swabs of nose/throat of the cases and close contacts were collected and tested for nucleic acids by real-time fluorescence quantitative RT-PCR. Results: From January 26 to February 20, 2020, a total of 67 COVID-19 cases and 15 asymptomatic infection cases related with the 1.19 rally were reported in Ningbo. The initial case was the infection source who infected 29 second generation cases and 4 asymptomatic infection cases, in whom 23 second generation cases and 3 asymptomatic infection cases once took bus with the initial case, the attack rate was 33.82% (23/68) and the infection rate was 38.24% (26/68). The risks of suffering from COVID-19 and being infected were 28.91 times and 26.01 times higher in rally participants taking bus with initial case compared with those taking no bus with initial case. In this epidemic, 37 third+generation cases and 11 related asymptomatic infection cases occurred, the attack rate was 2.88% (37/1 283) and the infection rate was 4.76% (48/1 008). The main transmission routes included vehicle sharing and family transmission. Conclusion: It was a cluster epidemic of COVID-19 caused by a super spreader in a massive rally. The epidemic has been under effective control. SN - 0254-6450 UR - https://www.unboundmedicine.com/medline/citation/32397698/[Investigation_of_a_cluster_epidemic_of_COVID_19_in_Ningbo]_ DB - PRIME DP - Unbound Medicine ER -