Abstract：Objective To analyze the clinical and epidemiological features of all coronavirus disease-2019 (COVID-19) confirmed cases reported in Baoshan District, Shanghai Municipality, and to provide a scientific basis for prevention and control of the COVID-19 epidemic. Methods According to Protocol for Prevention and Control of COVID-19 (Edition 4), the clinical and epidemiological characteristics of the COVID-19 confirmed cases in Baoshan District of Shanghai Municipality reported from January 19 to February 29, 2020 were described and analyzed. Results A total of 34 confirmed cases were reported by medical institutions of Baoshan District, including 31 mild and moderate cases (91.18%), 2 severe cases and 1 critical case. There were 6 clusters of household transmission, involving 23 cases and accounting for 67.65% of the total cases. The male to female sex ratio in the 34 cases was 1:1.27. The cases were aged between 1 and 80 years, and the median age was 53.5 years. 19 cases were aged above 40 years, accounting for 55.88%. Most of the cases were retirees and staff, accounting for 35.29% and 26.47% respectively. Among the 34 cases, 33 cases had definite sources of infection, among which 14 cases were related to Hubei (41.18%) and 19 cases were contacted with confirmed cases (55.88%). The cases in January were mainly related to Hubei (57.89%), but majority of the cases in February were associated with contacting confirmed cases (80.00%), mainly from the family clustering epidemic. The main clinical manifestations were fever, cough, sore throat and other respiratory tract symptoms. 2 (5.88%) cases had diarrhea and other gastrointestinal symptoms. The median interval from onset to first medical visit was 2 days (0-13 days), and 35.29% of the cases were not diagnosed as COVID-19 at first medical visit. The median interval from onset to diagnosis of suspected case was 3 days (0-17 days). The median interval from onset to confirmed diagnosis was 4 days (0-18 days). Conclusion The cases were mainly mild and common type, and the populations were generally susceptible. Most of the early cases in Baoshan District of Shanghai Municipality were related to Hubei Province, and the time from onset to diagnosis of suspected case was long. More than half of the cases were caused byliving together andclose contact. It is necessary to further strengthen the public health education and the training of medical professionals so as to improve the sensitivity of case diagnosis.
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2021, Vol. 28 
