Abstract：Objeetive The epidemiological characteristics of confirmed cases of the 2019 novel coronavirus diseases (COVID-19) which was reported in Wenzhou by February 28,2020 were described and analyzed to provide evidence for prevention and control measures in next stage. Methods The field investigation method was employed on all suspected and confirmed cases. The data of time,spatial and population distribution, source of infection and detective routes of all confirmed cases of COVID-19 in Wenzhou were collected and extracted from the reports of field investigation and the National Diseases Prevention and Control Information System. Results As of February 20,2020,504 confirmed cases of COVID-19 were diagnosed in Wenzhou, which included one death case. Among all 13 counties, the highest number of confirmed cases were distributed in Yueqing,Ruian and Lucheng. Among 504 cases, the male to female ratio was reported as 1.14:1. The youngest case was 2 years old while the oldest case was 93 years old. Most of the confirmed cases were among people between the ages of 25 and 64 years old. The most common occupation of the confirmed cases was businessman,which accounts for 29.76% (150 cases). Clinical symptoms of the first confirmed case of COVID-19 in Wenzhou occurred on January 4, 2020. Approximately 70% of cases had the first symptoms from January 19 to February 1. The daily number of new cases on January 24 and January 26 were the highest while the number of new cases per day declined significantly after February 2, and there were no new cases after February 14. Among all confirmed cases, the infection source of 61.71% cases were related to Wuhan. As of February 20, 2020, a total of 79 clusters were reported in Wenzhou, which involved 330 cases. Approximately 30% of confirmed cases came to hospitals unaccompanied by community staffs, and cases which confirmed after February 13 were basically found in central isolation locations or by grid checkers. Conclusions The main reason for the high case numbers of COVID-19 in Wenzhou, in Zhejiang province, was the high number of wenzhou citizens who work in Wuhan. Imported cases account for the most confirmed cases during the early period, while mainly confirmed cases were local cases during the middle and late periods. The outcomes suggest the prevention and control measures employed by Wenzhou government, which included closed-loop control and quantitative control, have achieved remarkable results and the epidemic of COVID-19 in Wenzhou has been initially controlled.
