Objective To analyze epidemiological characteristics of coronavirus disease 2019 (COVID-19) cluster cases in Inner Mongolia Autonomous Region (Inner Mongolia) for providing evidences to the control of COVID-19 epidemic.
Methods We collected the data on all confirmed, suspected and asymptomatic infection COVID-19 cases reported in Inner Mongolia from January 23 through February 28, 2020 and analyzed the data with descriptive epidemiology methods.
Results Totally 15 cluster epidemics involving 66 symptomatic cases were identified, accounting for 75.0% of all (n = 88) confirmed, suspected and asymptomatic infection COVID-19 cases reported during the 37-day period in Inner Mongolia. The cluster epidemics occurred in 10 of 11 prefecture-level administration regions with reports of COVID-19 cases and the number of cases ranged 2 to 11 for each of the clusters. The majority of the cluster cases were aged 28 – 73 years and the male to female ratio of the cases was 0.97 : 1. Among the 18 imported cases of the cluster epidemic, 14 (78%) had histories of travelling in Wuhan city. The most of the severe and critical cluster cases were aged 60 years and above and many of the cases suffered from some basic diseases. Of the cluster cases, 65.2%, 45.5% and 42.4% had clinical symptoms of cough, fever and expectoration, respectively.
Conclusion The cluster epidemics of COVID-19 in Inner Mongolia was mainly caused by imported cases and occurred among family members and community residents.
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