Objective To investigate the population density and seasonal variation of Aedes albopictus larvae in dengue prone and risk areas of Zhejiang province, China, 2020, and to provide basic data for the surveillance, prevention, and control of dengue fever. Methods Six surveillance sites were selected based on the presence or absence of local dengue fever cases in the past. In April to December 2020, mosq-ovitrap and Breteau index (BI) were used to monitor the population density of Ae. albopictus every 10 days of each month; Excel 2010 software was used for data arrangement, and GraphPad Prism 6 software was used to analyze the difference and correlation between mosq-ovitrap index (MOI) and BI. Results The mean MOI was 4.75, and the positive mosq-ovitraps containing both eggs and larvae had the highest proportion of 45.52%; the surveillance sites with local dengue fever cases in the past had a significantly higher MOI than those without local cases (5.72 vs. 3.73, χ2=64.050, P <0.05). The mean BI was 11.64, and idle containers (bowls, bottles, jars, and tanks) had the highest proportion of 56.13%; the surveillance sites with local dengue fever cases in the past had a significantly higher BI than those without local cases (15.54 vs. 7.63, χ2=391.800, P<0.05). MOI was positively correlated with BI in rural residential areas (r=0.739, P<0.05), while there was no statistical correlation between MOI and BI in urban residential areas (r=0.499, P=0.171). Conclusion There is a risk of dengue fever transmission in April-November in Zhejiang province, and the investigation results show that both MOI and BI can reflect the population density of Ae. albopictus larvae, which can be used to monitor the population density of dengue vector Aedes.
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