• Tianyu Feng, Yulong Zhang, Helin Sun, He Zhang, Mengzi Sun, Yudan Wang, Chong Sun, Kexin Li, Yingshuang Wang, Ruiyu Chai, Pingping Zheng, Yang Chen, Pan Pan, Chunli Bi, Yan Yao, and Siyu Liu.
• School of Public Health, Jilin University, Changchun Center for Disease Control, Changchun, Jilin.
• Medicine (Baltimore). 2021 Jul 2; 100 (26): e26298e26298.

AbstractIn this study, corona virus disease 2019 (COVID-19) transmission networks were built to analyze the epidemic situation of COVID-19 in Liaoning and Jilin provinces in early 2020. We explore the characteristics of the spread of COVID-19, and put forward effective recommendations for epidemic prevention and control. We collected demographic characteristics, exposure history, and course of action of COVID-19 cases. We described the demographic and case characteristics of these cases to show the basic characteristics of COVID-19 cases in both provinces. Combined with the spatial analysis of confirmed cases, the distribution law of the number of confirmed cases in different regions was analyzed. We exhibit the relationship among COVID-19 cases with a transmission network. The transmission characteristics of COVID-19 were analyzed through the transmission network. Mainly cases in Liaoning and Jilin provinces were imported cases from other provinces and the vast majority of these cases were related to Hubei province. The number of confirmed cases in different regions was positively correlated with their GDP and population. The main clinical symptoms of the cases were fever. Judge from the transmission network relationship between the 2 provinces, the transmission chain in Liaoning province contains fewer cases than that in Jilin province. The main transmission routes of the local cases in the 2 provinces were the family members, and the infection of the imported cases were mainly occurred in public places. It was estimated that the unidentified asymptomatic infected cases in the 2 provinces account for approximately 7.3% of the total number of infected cases. The length of the transmission chain suggests that the spread of COVID-19 can be effectively controlled with effective prevention measures.Copyright © 2021 the Author(s). Published by Wolters Kluwer Health, Inc.

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