Abstract：Objective To understand the population, seasonal fluctuation and drug resistance of Aedes mosquitoes, the vector of dengue fever in Hunan Province so as to provide a basis for prevention and control of dengue fever. Methods Six monitoring points were set up in the whole province to monitor the population and density of Aedes mosquito larvae and adults monthly from April to October 2020, and Aedes mosquito larvae were collected for drug resistance monitoring. The density of larvae was monitored by the Brayton index method and ovitrap method. Adult mosquitoes were monitored by double-layer net method. The resistance of larvae was monitored by dipping method. Adult mosquitoes were monitored by contact tube method. Results A total of 25,200 households were surveyed by the Brayton index method, and the Brayton index was 10.08, including 11.06 in urban residential areas and 9.10 in rural residential areas. It reached the peak of 19.42 in July and the lowest of 3.22 in October. A total of 25,100 ovitraps were deployed throughout the year. The ovitrap index was 6.31, which was 7.98 in urban residential areas and 4.67 in rural residential areas. It reached the peak in July, the oviposition index was 15.56, and the lowest was 0.16 in April. A total of 1,008 mosquito nets were distributed, and 590 Aedes albopictus were captured. The total net trapping index was 1.17 mosquitoes per net·hour. Among them, the highest trap index of Park/bamboo forest was 1.6 per net·hour, followed by that of urban residential areas (1.49 per net·hour). The annual density peak was 2.39 per net·hour in July, and the lowest was 0.03 pernet·hour in April. Resistance monitoring showed that adult mosquitoes in the six monitoring sites were resistant to pyrethroid insecticides, but sensitive to two carbamate insecticides. The levels of resistance of larvae to the three insecticides were mainlysensitive or low resistant. ConclusionAedes albopictus is the vector of dengue fever in Hunan Province, which is widely distributed in the whole province and has a high density in summer and autumn. Once there are imported cases, there are risks of local outbreaks and epidemics. It is the fundamental measure to prevent and control dengue fever to take comprehensive control measures based on breeding area control and scientific mosquito control.
2022, Vol. 29 
