Objective To investigate the species, density, and seasonality of mosquito vectors in the construction area of Beijing Daxing International Airport, China and establish basic records for mosquito vectors, and to provide a reliable basis for early warning of the risk of mosquito-borne diseases in the construction and future operation of the airport. Methods On the basis of the accomplished project of the Science and Technology Committee of Daxing District in 2014-"An investigation into the baseline status of vectors in the construction area of Daxing new airport", we selected mosquitoes as the major surveillance target in 2015 as they are closely related to vector-borne diseases, and carried out surveillance in the area of the new airport restricted in Beijing till the end of October 2017. Surveillance surrounded the terminal of the new airport and covered an area between 116°21'49″ and 116°26'50″ eastern longitudes and between 39°29'26″ and 39°33'25″ northern latitudes, consisting of Lixian town and Yufa town in Daxing district, Beijing. Surveillance was done once per 10 days from the beginning of May to the end of October in each year, continuing for 4 years. Six villages were randomly selected within the surveillance area, and they were adjusted every year because of demolition and relocation, but the total number remained unchanged. Three surveillance points (the environment outside farmhouses) were set up in each village. Adult mosquitoes were collected by the carbon dioxide lamp trapping method, and were identified and counted in the laboratory. Results Surveillance of adult mosquitoes continued for 4 years from 2014 to 2017, collecting 26 687 mosquitoes from 17 villages of 2 towns, with a density of 11.01 mosquitoes/lamp·hour. Those adult mosquitoes involved 4 genera and 6 species; Cx. pipiens pallens was the dominant species, accounting for 85.63%; minor species were Armigeres subalbatus and Aedes albopictus; Cx. tritaeniorhynchus and Anopheles sinensis were observed in relatively small numbers. The peak period of mosquito density was between late June and early September, with Ae. albopictus later in August. Conclusion The baseline data of the mosquito species, density and distribution were collected from the surrounding area of the terminal of Beijing Daxing International Airport. The data will provide the scientific basis for risk assessment, control planning and and efficacy evaluation for mosquito and mosquito borne diseases in this area.
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