Population characteristics of Aedes larvae and dengue risk analysis based on vector surveillance data in Henan Province,China,2019-2022
Objective To investigate the density and seasonality of the dengue vector Aedes populations in Henan Province,China,so as to provide a scientific basis for the risk assessment,monitoring,early-warning,and control of dengue fever.Methods From May to October of 2019 to 2022,Aedes vectors were monitored using the Breteau index(BI)method at 14 surveillance sites of Henan Province.Excel 2010 software was used to pool data,determine risk levels,and calculate the seasonal index.SPSS 25.0 software was used to perform the t-test and analysis of variance to compare the BI of different years and regions.Results The BI of Aedes mosquitoes from 2019 to 2022 were 15.31,14.27,11.34,and 12.32,respectively.The peaks occurred in July and August.Among 330 monitoring tasks over the four years,a regional spread risk was indicated in 85(25.76%),an outbreak risk indicated in 70(21.21%),a transmission risk indicated in 77(23.33%),and no risk indicated in 98(29.70%).The proportion of areas reaching a regional spread risk in southern Henan Province was higher than that in the northern part and along the Yellow River.The BI results of 2020,2021,and 2022 were not significantly different from that of 2019(all P>0.05).The BI showed no significant difference between regions(all P>0.05).Conclusions The density of Aedes mosquitoes is high in Henan Province,and there is a potential risk of dengue transmission in the peak season of Aedes for most surveillance sites.The number of imported dengue cases is expected to increase substantially in the future,highlighting the need for close attention to domestic and international dengue changes and emergency response and preparedness.
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NSTL
万方数据
