Objective To investigate the density changes of larvae and adults of dengue vector Aedes albopictus in the Meishe River basin in Haikou, Hainan province, China, and to provide scientific suggestions for the prevention and control measures of dengue fever. Methods Five surveillance sites were selected from densely populated regions of the Meishe River basin in Haikou. The Breteau index (BI) method and the double-layered mosquito net method were used to monitor the dengue vector Ae. albopictus throughout the year of 2021. WPS 2020 software was used to summarize and collate the surveillance results. SPSS 17.0 software was used to analyze the correlation between BI, container index (CI), and net trap index. The Chi-square test was used for comparison of rates. Results The mean BI was 25.33 and CI was 38.31% in 2021. There was a statistical difference in CI between the five surveillance sites (χ2=45.911, P<0.001). The net trap index of adult Ae. albopictus was 15.98 mosquitoes/net·hour. The density of mosquitoes in different habitats was in the following order: rural-urban fringe areas>residential areas>parks. The peak of Ae. albopictus density occurred from May to November. BI reached its peak in September, and the density of adult mosquitoes reached its peak in October. BI was positively correlated with CI and net trap index in the same period (r=0.720, P=0.008; r=0.709, P=0.010); CI was positively correlated with net trap index (r=0.623, P=0.030). The CI of temporary water containers and fixed water containers were 37.91% and 40.54%, respectively, with no statistical difference (χ2=0.735, P=0.391). There was a statistical difference in CI between the nine types of breeding sites (χ2=95.097, P<0.001). Specifically, waste tires had the highest CI (67.03%). Conclusion The density of Ae. albopictus in the Meishe River basin is relatively high. Once dengue cases occur, there is a risk of local epidemic. Comprehensive environmental management should be strengthened to eliminate mosquito breeding sites to prevent mosquito infestation.
YANG Xin-yan, ZHONG Wen-bing, LIN Yi, CAI Fang, LIU Yi, KUANG Zhi-zheng
. Surveillance and analysis of dengue vector Aedes albopictus in the Meishe River basin in Haikou, Hainan province, China, 2021[J]. Chinese Journal of Vector Biology and Control, 2022
, 33(6)
: 823
-827
.
DOI: 10.11853/j.issn.1003.8280.2022.06.011
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