Epidemiological analysis of severe fever with thrombocytopenia syndrome in Dandong,Liaoning Province,China,2011-2023
Objective To analyze the population,temporal,and spatial characteristics of the reported cases of severe fever with thrombocytopenia syndrome(SFTS)in Dandong,Liaoning Province,China,2011-2023,so as to provide evidence for formulating SFTS prevention and control measures.Methods Excel 2007 software was used to establish a database.SPSS 23.0 software was used to conduct descriptive analysis on the population,time,and regional characteristics of SFTS.Rate or percentage was used to describe count data.The comparison of rates was conducted using Chi-square test.Joinpoint Regression 5.0 software was used to analyze the changes in incidence rate based on the Joinpoint Regression Program.Results From 2011 to 2023,a total of 558 cases of SFTS were reported in Dandong,with an average annual incidence of 1.83/100 000.The annual incidence increased,slightly decreased,and then increased,showing an overall increasing trend(χ2trend=51.489,P<0.001).The male-to-female ratio of the cases was 1.17:1.The cases mainly occurred in individuals with 45-<80 years of age(87.10%).In terms of occupation,the disease mainly affected farmers(66.85%).The incidence of SFTS showed obvious seasonality,with the reported cases mainly distributed from May to October,and the incidence peaked from July to September.The top two counties,county-level cities,and districts in terms of reported cases and average annual incidence were all Kuandian County(256 cases,4.70/100 000)and Fengcheng City(201 cases,2.78/100 000).The top five townships in terms of cumulative number of reported cases were Kuandian Town in Kuandian County,Bianmen Town in Fengcheng City,Maodianzi Town in Kuandian County,Shicheng Town in Fengcheng City,and Guanshui Town in Kuandian County.The top five townships in terms of average annual incidence were Maodianzi Town in Kuandian County,Dachuantou Town in Kuandian County,Yangmuchuan Town in Kuandian County,Hushan Town in Kuandian County,and Shicheng Town in Fengcheng City.Conclusions The incidence of SFTS in Dandong increased and showed obvious seasonal and regional distribution.The distribution of cases showed a trend of spreading from the middle and low mountain areas in the north of Dandong to the central hilly area and the central and southern plain areas.Middle-aged and elderly farmers were the primary affected populations.Significant emphasis should be placed on the prevention and control of SFTS.Comprehensive measures should be taken to control the SFTS epidemic in high-incidence areas.
Severe fever with thrombocytopenia syndromeEpidemiologySeasonalityRegional distribution
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