Objective To analyze epidemiological characteristics of confirmed coronavirus disease 2019 (COVID-19) cases reported from January 20 to March 24, 2020 and the effectiveness of prevention and control measures on COVID-19 epidemic in Shanghai city.
Methods Through China Information System for Disease Control and Prevention and the official website of Shanghai Municipal Health Commission, we collected detailed data on all confirmed COVID-19 cases reported during the period in Shanghai city and analyzed the data using descriptive epidemiological methods.
Results Of 433 confirmed COVID-19 cases registered during the period in the city, 169 (39.03%) were aged 18 – 40 years. The trajectory of this COVID-19 epidemic in Shanghai city could be divided into five stages of the first slowly rising, rapidly rising, slowing down rising, transient zero reporting, and the second slowly rising. The stage transition of the epidemic was closely related to the implementation of prevention and control measures. The highest observed daily ratio of local infected cases/imported cases was 0.5022 and the ratio varied in different epidemic stages and administrative regions of the city. The implemented measures against COVID-19 epidemic are generally effective in Shanghai city.
Conclusion Detection of imported cases in time and development of targeted measures should be strengthened in future prevention and control of COVID-19 epidemic in Shanghai city.
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