Journal of Shandong University (Health Sciences) ›› 2020, Vol. 58 ›› Issue (4): 58-61.doi: 10.6040/j.issn.1671-7554.0.2020.284

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Incidence analysis of 1 403 close contacts of corona virus disease 2019 patients in different contact modes

ZHOU Lin1*, LIU Xiaoxue1*, LI Zhan1, GENG Xingyi1, LIU Qingjie2   

  1. 1. COVID-19 Disposal Team of Jinan Center For Disease Control And Prevention, Jinan 250021, Shandong, China;
    2. Zhangqiu Center For Disease Control And Prevention, Jinan 250000, Shandong, China
  • Published:2022-09-27

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Abstract: Objective To study the exposure and incidence of close contacts of corona virus disease 2019(COVID-19)cases. Methods The retrospective epidemiological method was used to describe and analyze the contact and incidence of 1 403 close contacts from January 23 to February 29, 2020, and the comparative analysis was made using χ2 test. Results The frequency of close contacts was mainly occasional(78.62%). There was a difference in the composition of locations and ways of contact between contacts of local and nonlocal cases. The attack rate of close contacts of local cases was 2.37%, and that of nonlocal cases was 0. The mean attack rate of all close contacts was 1.78%. Conclusion The incidence of close contacts has a correlation with the frequency and degree of contact. Living together results in the frequent contact, which further leads to multiple clusters in families. The attack rate of family cluster is significantly higher than that of other contacts. Implementing family prevention and control measures will help reduce the attack rate of family cluster.

Key words: Corona virus disease 2019, Close contacts, Attack rate

CLC Number: 

  • R181.3
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