Objective To analyze the etiological dectection results of severe fever with thrombocytopenia syndrome (SFTS) in Anqing City,and to provide basic data for the scientific prevention and control of SFTS. Methods RT-PCR was used to detect dabie bandavirus (DBV) in 502 serum samples of suspected SFTS cases,and the epidemiological information of confirmed cases was analyzed by SPSS 25.0.S gene sequencing was performed on some isolated virus strains to construct a phylogenetic tree. Results Among 502 samples of suspected SFTS cases,151 were positive for DBV RNA,with a positive rate of 30.08%.The ratio of the male positive rate (27.83%) to female positive rate (31.72%) was 0.88∶1.There was a significant difference in the positive rate among all age groups (χ2=15.271,P=0.033),and 71-80 years old group accounted for the highest proportion(38.84%).Farmers accounted for 84.77% of the total number of cases.The cases were distributed from April to October,and cases in May accounted for the highest proportion (27.82%).Taihu County had the highest proportion of cases (34.75%),and there were statistical differences in the positive rate among different countries (χ2=18.080,P=0.021).S fragments of 21 DBV strains were obtained,including 10 strains of the F genotype,5 strains of the A genotype,5 strains of the E genotype,and 1 strain of the B genotype. Conclusion In Anqing City and surrounding areas,the SFTS epidemic showed regional and seasonal distribution.Middle-aged and elderly people engaged in agricultural work are high-risk groups.The main genotype of DBV was F.
Key words
Severe fever with thrombocytopenia syndrome /
Dabie bandavirus /
Genotyping
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