关键词: 流行性乙型脑炎, 蚊媒, 监测, 三带喙库蚊

Abstract: Objective To study the population dynamics and the distribution characteristics of the vector mosquitoes of Japanese encephalitis (JE) in Kaijiang county, Sichuan province for providing a scientific basis for JE control and prevention. Methods Three sampling points were selected for each of the surveillance sites, the rice fields, the pens for livestock and the rooms for people in JE epidemic area of Kaijiang county during May to September 2011, and mosquitoes were caught 15 min a time, 2 times a month, with the captured insects identified. Results A total of 4734 mosquitoes were caught from June to September with an average density of 210.4/labor hour. The density was 247.3/labor hour in the rice fields, 267.7/labor hour the pens for livestock, 114.3/labor hour the rooms for people, respectively. Of the 1855 mosquitoes captured in the rice fields, Culex tritaeniorhynchus accounted for 93.21% and Cx. pipiens quinquefasciatus for 5.55%, and of the 2023 mosquitoes captured in the pens for livestock Cx. tritaeniorhynchus accounted for 44.04%, Cx. pipiens quinquefasciatus for 33.81% and Anopheles sinensis for 22.15%. Of the 856 mosquitoes captured in the rooms for people Cx. pipiens quinquefasciatus accounted for 72.20% and Cx. tritaeniorhynchus for 22.08%. The Cx. tritaeniorhynchus density peaked in the rice fields in the first ten days and the last ten days of June (570.7/labor hour and 583.3/labor hour), in the pens for livestock in the last ten days of July (265.3/labor hour) and the last ten days of September (533.3/labor hour), and in the rooms for people in the first ten days of August (70.7/labor hour). Conclusion In terms of the JE vector mosquitoes in Kaijiang county, Cx. tritaeniorhynchus is mainly distributed in the rice fields and pens for livestock, and Cx. pipiens quinquefasciatus mainly in the rooms for people. The peak season of JE incidence is consistent with the peak density distribution of Cx. tritaeniorhynchus in the rice fields and pens for livestock.

Key words: Japanese encephalitis, Vector mosquito, Surveillance, Culex tritaeniorhynchus