Objective To analyze the density levels and change patterns of vector Aedes mosquitoes in Yibin, Sichuan Province, China, 2017-2023, so as to provide a scientific basis for dengue fever prevention and control. Methods From May to October each year from 2017 to 2023, surveillance was conducted at mosquito surveillance sites in Yibin using the Breteau index (BI) method and the human-baited double-net method. The BI, container index (CI), house index (HI), and human-baited double-net index (HBDNI) were calculated. Statistical analysis was conducted using SPSS 27.0 software. Spearman analysis was performed to assess the correlation between BI and mosquito-net trapping index. Chi-square test and Kruskal-Wallis H rank-sum test were used to compare differences in the density of Ae. albopictus across years, months, seasons, container types, and surveillance habitats. Results From 2017 to 2023, BI ranged from 2.50 to 16.22, CI from 3.85% to 10.14%, HI from 2.33% to 10.65%, and HBDNI from 0.54 to 5.72 individuals/net·h. Overall, BI showed an increasing trend, CI and HI also increased, and the coefficients of their correlations with BI were 0.818 (P<0.001) and 0.939 (P<0.001), respectively. BI peaked in May to July while HBDNI peaked in June to September, both exhibiting bimodal distributions. There was a positive correlation between BI and HBDNI, with a regression equation of y (HBDNI) = 0.28x (BI)+0.63. Bonsai and aquatic plants as breeding containers showed the highest positive rate (CI=8.92%). Among the three habitats, park had the highest HBDNI of 5.04 individuals/net·h. In 168 instances of surveillance for juvenile mosquitoes, 64 (38.10%) showed a risk of dengue transmission and higher levels, while in 258 instances of surveillance for adult mosquitoes, 47 (18.21%) exceeded the control threshold for adult mosquitoes. Conclusions Both the BI and the HBDNI in Yibin increased with fluctuations, indicating a persistent risk of dengue fever transmission. A long-term mechanism should be established to maintain Aedes mosquito density below the transmission threshold to prevent the occurrence and progression of local dengue outbreaks.
LIU Yao, ZHOU Ping, XIAO Quan-quan, TAN Qi-xiang, LI Jia-qi
. Surveillance of Aedes mosquitoes as vectors of dengue fever in Yibin， Sichuan Province， China， 2017-2023[J]. Chinese Journal of Vector Biology and Control, 2025
, 36(2)
: 165
-170
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DOI: 10.11853/j.issn.1003.8280.2025.02.005
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