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[Transmission chains of clusters of COVID-19 associated with a market in Beijing].
Sun, Y M; Liu, Feng; Cai, Wei; Wang, Lei; Liu, Fangyao; Li, Yulian; Wang, Juguang; Ying, Huaqing; Fu, Jiye.
  • Sun YM; Haidian District Center for Disease Control and Prevention, Beijing 100094, China.
  • Liu F; Haidian District Center for Disease Control and Prevention, Beijing 100094, China.
  • Cai W; Haidian District Center for Disease Control and Prevention, Beijing 100094, China.
  • Wang L; Haidian District Center for Disease Control and Prevention, Beijing 100094, China.
  • Liu F; Haidian District Center for Disease Control and Prevention, Beijing 100094, China.
  • Li Y; Haidian District Center for Disease Control and Prevention, Beijing 100094, China.
  • Wang J; Haidian District Center for Disease Control and Prevention, Beijing 100094, China.
  • Ying H; Haidian District Center for Disease Control and Prevention, Beijing 100094, China.
  • Fu J; Haidian District Center for Disease Control and Prevention, Beijing 100094, China.
Zhonghua Liu Xing Bing Xue Za Zhi ; 42(3): 427-432, 2021 Mar 10.
Article in Chinese | MEDLINE | ID: covidwho-1534262
ABSTRACT

Objective:

To investigate the clusters of COVID-19 associated with a market (market Y) in Haidian District, Beijing, and analyze the chain of transmission and provide reference for effective prevention and control of COVID-19.

Methods:

The investigation of field epidemiology and cluster epidemic was used to describe the distributions of all COVID-19 cases. The time sequence diagram of the cases, disease onset was drawn and transmission chains were analyzed. Real-time RT-PCR assay was conducted for SARS-CoV-2 nucleic acid test by using the respiratory samples of the cases.

Results:

The COVID-19 epidemic, originated from a wholesale farm produce market (market X) in Fengtai District, Beijing, was introduced by a marketer in the market Y who had exposed to market X, causing 8 clusters of 20 confirmed cases of COVID-19 and one asymptomatic case, including 8 men and 13 women, in market Y, surrounding communities, food plaza, companies,families and other places. The incidence peaked during June 10-14, 2020; the median age of the cases was 45 years, ranging from 5 years to 87 years. The initial symptoms of the cases included fever (10/20) and pharynx discomfort (7/20). The median of incubation period was 5 days (IQR3-8). The median of serial interval between primary case and secondary cases was 5 days with a secondary attack rate of 3.7%(20/538), and the secondary attack rate in household close-contacts was 14.0% (7/50).

Conclusions:

The clusters of COVID-19 associated with market Y were caused by several modes of transmission, including human-to-human, contaminated material-to-human, etc. The combined public-health response measures were effective to control the COVID-19 epidemic in Haidian district of Beijing.
Subject(s)

Full text: Available Collection: International databases Database: MEDLINE Main subject: Epidemics / COVID-19 Type of study: Observational study Limits: Female / Humans / Male / Middle aged Country/Region as subject: Asia Language: Chinese Journal: Zhonghua Liu Xing Bing Xue Za Zhi Year: 2021 Document Type: Article Affiliation country: Cma.j.cn112338-20201027-01285

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Epidemics / COVID-19 Type of study: Observational study Limits: Female / Humans / Male / Middle aged Country/Region as subject: Asia Language: Chinese Journal: Zhonghua Liu Xing Bing Xue Za Zhi Year: 2021 Document Type: Article Affiliation country: Cma.j.cn112338-20201027-01285