Journal of Shandong University (Health Sciences) ›› 2020, Vol. 58 ›› Issue (4): 49-53.doi: 10.6040/j.issn.1671-7554.0.2020-396

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Investigation of a COVID-19 case with unknown cause and its close contacts

LIU Zhong1, ZHAO Mengjiao1, YANG Guoliang1, ZHAO Huailong1, WANG Linlin2, CHANG Caiyun1, GENG Xingyi1   

  1. 1. Emergency Response Group, Jinan Municipal Center for Disease Control and Prevention, Jinan 250021, Shandong, China;
    2. Department of Infectious Disease Control, Center for Disease Control and Prevention of Shizhong District, Jinan 250000, Shandong, China
  • Published:2022-09-27

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Abstract: Objective To retrospectively analyze a family cluster of coronavirus disease 2019(COVID-19)with unknown cause in Jinan City. Methods One case of COVID-19 and two second-generation cases were investigated using field epidemiological methods, and 29 close contacts were quarantined. All cases received nucleic acid test with RT-PCR. Results All three cases were family clusters. The initial case(case A)had a short history of travel before onset, but the source of infection was unclear. Cases B and C lived with case A and were infected. Other close contacts with short contact time, low contact frequency and protective measures showed no abnormalities and were tested negative. Conclusion As 2019-nCoV is highly infectious, early detection and early screening of close contacts should be the focus of prevention and control.

Key words: Coronavirus disease 2019, Cluster, Epidemiological investigation, Close contacts

CLC Number: 

  • R181.3
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