Objective To investigate the dengue vector Aedes density and seasonal fluctuation in Nanning, Beihai, Qinzhou, and Baise, Guangxi Zhuang Autonomous Region, China, and to provide a strong basis for the scientific prevention of dengue fever. Methods According to the "Special investigation of dengue vector Aedes" issued by Chinese Center for Disease Control and Prevention, the Breteau index (BI) method, the mosq-ovitrap index (MOI) method, and the double-layered mosquito net method were used to monitor the density of larval and adult Ae. albopictus mosquitoes in 2020-2021. ArcGIS 10.5 software was used to plot the spatial distribution of surveillance sites of vector Aedes. SPSS 16.0 software and the one-sample t-test were used to perform the statistical analysis. Results In 2020-2021, the overall mean BI, MOI, and net trap index at all surveillance sites were 10.83, 9.39, and 2.04 mosquitoes/net·hour, respectively. According to the statistical analysis, At most surveillance sites, there were statistical differences between BI and the overall mean BI (all P<0.05), between the net trapping index and the overall mean net trap index (all P<0.05). At half of the surveillance sites, there were no statistical difference between MOI and the overall mean MOI (all P>0.05). The BI at all surveillance sites was higher than 5.00 from March to November, and reached the peak value (16.73) in August. The MOI at all surveillance sites was higher than 5.00 from April to October, and reached the peak value (20.86) in July. The net trap index at all surveillance sites was higher than 2.00 mosquitoes/net·hour from May to September, and reached the peak value (4.57 mosquitoes/net·hour) in July. Conclusion The density of Aedes mosquitoes in Guangxi Zhuang Autonomous Region is at a relatively high level. The results suggested it is urgent to carry out the prevention and control of adult Aedes mosquitoes from July to August and the breeding sites cleaning of Aedes larvae from August to September, so as to control the mosquito density below the safety threshold and reduce the risk of dengue outbreak.
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