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| Epidemiological investigation on the first family cluster of COVID-19 in Lanzhou |
| WANG Yuhong, ZHANG Wei, ZHANG Xiaoyu, MA Hanping, WANG Zhaojun, ZHANG Yan, SU Yanjun, LI Hongrong
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| Lanzhou Center for Disease Control and Prevention, Lanzhou, Gansu 730000, China |
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Abstract Objective To investigate the first family cluster of COVID-19 in Lanzhou, so as to provide basis for improving the COVID-19 outbreak prevention capacity. Methods On January 23, the First Hospital of Lanzhou University reported two suspected cases of COVID-19.According to the COVID-19 Epidemiological Investigation Plan ( second edition ) , general information, disease diagnosis and treatment, clinical symptoms, laboratory test results, household environment, exposure history and close contacts were collected to figure out the source of infection and routes of transmission. Results This family cluster lasted 29 days, from January 23 to February 21, reporting nine confirmed cases ( one death ) and one asymptomatic case. There were three imported cases from Wuhan, who were the source of the cluster; and seven secondary cases, who all had close contact with the imported cases during daily life or through having dinners. The secondary attack rate was 41.18% ( 7/17 ) . Among 9 confirmed cases, the incubation period ranged from four to ten days, with a median of nine days. Except for seven secondary cases, 24 close contacts were found and detected negative in the nucleic acid tests. Conclusions The first family cluster of COVID-19 in Lanzhou is caused by the imported cases from Wuhan. All the secondary cases have had dinners and/or had contact with the imported cases, thus they are infected through respiratory droplets and close contact.
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Received: 20 March 2020
Revised: 01 July 2020
Published: 10 September 2020
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