关键词: 白纹伊蚊, 密度, 登革热, 风险等级

Abstract: Objective To investigate the density changes and seasonal fluctuations of Aedes albopictus in Huangpu District, Guangzhou, China, and evaluate the risk of dengue fever transmission, so as to provide a basis for the prevention and control of the dengue vector. Methods The surveillance data on the density of Ae. albopictus between 2019 and 2023 were collected from 17 subdistricts/townships in Huangpu District. The data were sorted and analyzed for changes in indices such as Breteau index (BI), standard space index (SSI), mosquito ovitrap index (MOI), and adult mosquito density index (ADI). Descriptive epidemiology was used to analyze the data and determine the risk levels of mosquito vector density based on larval mosquito indices (BI or SSI) and adult mosquito densities (MOI or ADI). Chi-square tests were used for comparing the rates. Results From 2019 to 2023, BI, SSI, MOI, and ADI in Huangpu District were 2.91-5.58, 0.64-1.41, 4.18-7.52, and 2.63-5.15 mosquito/person·h, respectively. The population density of Ae. albopictus was at a relatively low level from November of one year to March of the following year and showed a rapid upward trend starting in April; it remained at a peak plateau from May to September and gradually decreased after October. The proportion of subdistricts/townships grade 0 risk was highest in January and February, and the proportion of grades 1, 2, and 3 risks peaked from April to October. From 2019 to 2022, the proportion of subdistricts/townships grades 2 and 3 risks at the mosquito vector density surveillance sites showed a decreasing trend year by year, while it significantly increased in 2023. Conclusions The inspection and cleaning of mosquito breeding sites should begin earlier than April. The mosquito vector density peaks from May to September, posing a high risk of dengue fever transmission. It is necessary to raise public awareness of mosquito prevention, conduct timely mosquito control, and prevent the development and spread of dengue fever.

Key words: Aedes albopictus, Density, Dengue fever, Risk level