[The epidemiological characteristics of the outbreak of Dengue fever in Fuzhou City from 2016 to 2023].

Abstract

To analyze the epidemiological characteristics of dengue fever in Fuzhou City from 2016 to 2023, it was found that a total of 1 697 cases of Dengue fever (1 512 local cases and 185 imported cases) were reported in Fuzhou City from 2016 to 2023, and a total of 15 dengue-related public health emergencies were reported, with an average duration of the epidemic. The average duration of the epidemic was 71.6 days. Local dengue fever cases: the peak incidence period was concentrated in August-October, accounting for 96.69% (1 462/1 512); distributed in 10 counties and districts, the three counties with the highest annual average incidence rate were Minhou County (9.95/100 000), Cangshan District (6.03/100 000), and Taijiang District (5.58/100 000); in 2019 (Moran's I=0.18, P<0.05) and 2023 (Moran's I=0.5, P<0.05) the spatial distribution of local dengue fever cases in Fuzhou City showed a clustering pattern, with Gulou, Taijiang, Cangshan, and Jin'an districts as high-high clustering areas, and the outbreaks basically clustered in the urban areas; the median age was 47 years old, and the proportion of 40-70 years old was 50.93% (770/1 512). Among the local cases of Dengue fever, 81.15% (1 227/1 512) were unemployed, and 6.81% (103/1 512) were students with the highest proportion.The median time between onset diagnosis was 3.38 d, 6.67 d, 3.50 d, 3.75 d in 2016-2019, and 3.46 d in 2023, respectively, and the years of onset. The difference in the median time between onset and diagnosis was not statistically significant (χ²=8.556 4, P>0.05). Imported cases: mainly from Southeast Asian countries, Cambodia, Papua New Guinea, Indonesia accounted for the highest proportion of 62.70% (116/185); May to September is the active period of Aedes albopictus, and the results of Aedes albopictus resistance test showed that the mosquito larvae were sensitive to residual chlorpyrifos, and the Aedes albopictus adult mosquitoes showed sensitivity to two organophosphorus insecticides (chlorpyrifos, malathion), and to one type of Aedes albopictus adults were sensitive to two kinds of organophosphorus insecticides (chlorpyrifos, malathion) and a kind of pyrethroid carbamate insecticide (carbofuran).