Objective To analyze the spatio-temporal distribution and environmental factors of dengue fever in China from 2020 to 2022.
Methods Descriptive epidemiological method were used to analyze the spatio-temporal and environmental characteristics of indigenous and imported dengue fever in China.
Results From 2020 to 2022, a total of 1185 indigenous cases and 217 imported cases were reported in 5 provinces and 19 provinces, respectively. Dengue fever was seasonal, with the highest incidence of indigenous cases from September to November and imported cases from June to November. The majority (97.64%) of indigenous cases occurred in Yunnan and Guangxi, and the local outbreak of dengue fever in Yunnan was mainly caused by imported dengue fever from Myanmar. Moreover, 67.28% of imported cases occurred in Guangdong, Fujian, Yunnan, and Zhejiang, and 83.41% of the cases were imported from Southeastern Asian countries. Demographic and economic conditions of Guangdong were responsible for the highest number of imported cases in the province from 2020 to 2022.
Conclusion The local outbreaks of dengue fever in China were caused by imported cases, with significant local and seasonal characteristics. It is necessary to monitor mosquito vectors, dengue fever, and related environmental factors in these provinces, and sustainable mosquito vector management measures should be implemented.
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