National vectors surveillance report on mosquitoes in China, 2018
GUO Yu-hong, WU Hai-xia, LIU Xiao-bo, YUE Yu-juan, REN Dong-sheng, ZHAO Ning, LI Gui-chang, SONG Xiu-ping, LU Liang, LIU Qi-yong
State Key Laboratory of Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, WHO Collaborating Centre for Vector Surveillance and Management, Beijing 102206, China
Abstract：Objective To analyze the mosquito surveillance data of the National Vectors Surveillance in China in the 31 provincial regions (provinces, autonomous regions, or municipalities directly under the central government) in 2018 and investigate the species composition, distribution, and seasonality of mosquito vectors, and to provide a basis for the risk analysis of mosquito-borne diseases and mosquito vector control program. Methods In 2018, the lamp trapping method, double mosquito net method, Breteau index (BI) method, scoop capture method, and route method were used to capture mosquitoes and record their numbers. The mosquito vector surveillance data throughout 2018 were collected from 90 national surveillance sites in the 31 provincial regions and analyzed by Excel 2013. Results In 2018, the dominant mosquito species in China's residential areas were Culex pipiens/Cx. pipiens quinquefasciatus, which accounted for 60.25% of all captured mosquitoes, followed by Cx. tritaeniorhynchus, Anopheles sinensis, Aedes albopictus, and Ae. aegypti, which accounted for 21.64%, 7.19%, 2.61%, and 0.23%, respectively. In all habitats, livestock sheds had the highest mosquito density, reaching 31.96 mosquitoes/lamp·night, followed by livestock farms and rural households, with 13.08 and 11.32 mosquitoes per lamp per night, respectively; the mosquito density was relatively low in parks, hospitals, and residential areas. The adult mosquito density began to increase during April to May, remained high during June to September, and declined in October; the density of mosquito larvae increased slightly earlier than that of adult mosquitoes. More Ae. albopictus was captured with the double mosquito net method than with other methods in all habitats, especially during June to September. Rural natural villages had the highest BI (22.04). Conclusion The mosquito surveillance data of the National Vectors Surveillance in China in 2018 showed a certain risk of mosquito-borne diseases such as dengue fever, Japanese encephalitis, and malaria in the residential areas of China. The mosquito density in livestock sheds was much higher than that in livestock farms, suggesting that intensive livestock production pattern may avoid mosquito infestation. The peak season of mosquitoes was from June to September, but larvae positive water bodies were found in early investigations, so mosquito vector control should be carried out early and continuously. Rural natural villages had a high mosquito density, and the risk of mosquito-borne diseases do exist. It is recommended to strengthen mosquito vector surveillance in order to provide accurate data for target mosquito control and provide a scientific basis for effective control of mosquito-borne diseases in China.
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