1. School of Public Health, Guangdong Medical University, Dongguan, Guangdong 523808, China; 2. Dongguan Municipal Center for Disease Control and Prevention, Dongguan, Guangdong523800, China
Abstract：Objective To analyze the epidemic characteristics of domestically-transmitted and foreign-imported COVID-19 cases from February 26, 2020 to April 21, 2020, to understand the time-phase differences in different types of cases, and to provide a basis for epidemic prevention and control. Methods A cross-sectional study was conducted to obtain case data from the official website of the National Health Commission for statistical description and analysis. Pearson correlation coefficient was used to analyze the correlation between the accumulative number of newly-imported cases and the accumulative number of newly-confirmed cases. Tableau 2018 software was applied to mapping the spatial and temporal distribution patterns of COVID-19. Results As of April 21 at 24:00pm, the cumulative incidence rate in China was 6.02/100,000, the cumulative fatality rate was 5.51%, and the cumulative cure rate was 92.59%. The cumulative proportion of COVID-19 cases imported from abroad was 1.91% (1,610/84,287). The number of newly-confirmed cases per day showed a decreasing trend on the whole, and gradually changed from the local cases in the early stage to the imported cases from abroad. The accumulative foreign-imported cases and the accumulative new cases showed a highly positive correlation (r=0.883, P<0.001). The distribution of foreign-imported cases was uneven, with more concentrated cases in Heilongjiang, Beijing, Shanghai and Guangdong. Conclusions At present, the domestic epidemic situation has been fully controlled, and the overall epidemic prevention and control work has achieved great results. Relevant departments should pay attention to the further impact of foreign-imported cases and asymptomatic carriers on the epidemic situation in China, and strengthen prevention and control efforts in key areas.
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2021, Vol. 28 
