Epidemiological characteristics of dengue fever in Mengla County,Xishuangbanna Prefecture,Yunnan Province,2013-2023
Objective To fully understand and analyze the epidemic patterns of dengue fever in Mengla County,Xishuangbanna,and provide a basis for the prevention and control of local outbreaks of dengue fever in Xishuangbanna and other border areas of Yunnan Province. Methods Descriptive epidemiological methods were employed to systematically analyze the temporal,geographical,and demographic distribution characteristics of dengue fever in Mengla County,Xishuangbanna Prefecture,from 2013 to 2023. Results From 2013 to 2023,a total of 3220 cases of dengue fever were reported,including 2850 local cases (88.51％) and 370 imported cases (197 cases imported from overseas,173 cases imported domestically),accounting for 11.49％. Local cases and imported cases were concentrated between July and October,showing seasonal and local characteristics,with a high incidence from August to October,mainly distributed in Mengla Town and Mohan Town. The male-to-female ratio of local cases from 2013 to 2023 was 1.17∶1,and the 20-50 age group accounted for 66.91％ of cases. There was a statistically significant difference in the incidence of dengue fever across different age groups for local cases from 2013 to 2023 (x2=372.711,P<0.05). The top three occupations with the highest number of local cases were farmers 43.79％ (1248/2850),students 11.19％ (319/2850),and business service workers 7.54％ (215/2850),with the number of imported cases were farmers 126 cases (34.05％),business service workers 61 cases (16.49％),and students 27 cases (7.30％). The number of imported cases peaked in 2023 with 163 cases (44.05％ of the total number of imported cases). The Breteau index (BI) from 2013 to 2023 showed an increase in vector density starting in May,with BI between 5-15;a peak in vector density from July to September,with BI between 10-40,and most BI between 20-40;and a gradual decline in October and November,with BI between 5-20. Conclusions The dengue fever outbreak in Mengla County of Xishuangbanna is caused by imported cases,leading to local outbreaks,and exhibiting significant local and seasonal characteristics. The imported cases mainly originated from Southeast Asian countries. Mengla County should remain vigilant,strengthen the monitoring of cross-border transmission,thoroughly implement case surveillance and mosquito prevention and control measures,and adopt timely and effective prevention and control measures at the early stage of the outbreak to prevent large-scale outbreaks and epidemics .
Dengue feverepidemiological characteristicsprevention and control measures
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