中缅边境地区孟连和澜沧县登革热媒介蚊虫调查

目的了解中缅边境地区孟连和澜沧县登革热媒介种类、生态习性和登革热病毒自然感染状况,为登革热预防控制提供科学依据。方法在孟连和澜沧县选择3个自然村作为监测点,采用人工诱捕法白天诱捕成蚊,并在房屋内外积水容器捕捞幼虫,采用RTPCR方法对现场捕获的成蚊进行登革热病毒检测。结果 2010年6-10月在孟连和澜沧县监测点共捕获蚊虫6属8亚属22种3436只,其中白纹伊蚊为优势蚊种,占捕蚊总数的33.82%;未捕到埃及伊蚊。3个观察点白纹伊蚊平均房屋指数19.3,容器指数5.84,布雷图指数30.3,千人指数68.5;白纹伊蚊孳生环境类型以竹筒、土罐类和旧轮胎等临时积水容器为主,分别占阳性积水容器数的34.1%、27.5%和17.6%;白纹伊蚊成蚊平均密度为8.98只/人工小时;成蚊密度高峰出现在7-8月;对捕获的29批白纹伊蚊(1162只)进行RTPCR检测,未发现登革热病毒感染。结论白纹伊蚊密度较高且分布广泛,应加强当地登革热监测工作。

A survey of dengue fever vectors in Menglian and Lancang counties,Myanmar border

Objective To investigate the species composition,ecological habitats and the natural infection of the dengue vectors in Menglian and Lancang counties bordered with Myanmar in Yunnan province,so as to provide evidence for the prevention and control of dengue fever.Methods Three villages in Menglian and Lancang counties were selected as surveillance sites.Adult mosquitoes were captured by human-landing catches and Aedes mosquito larvae were collected from various types of indoor and outdoor water containers in the three surveillance sites.Dengue virus in mosquitoes was detected by RT-PCR.Results A total of 3436 individual adult female mosquitoes of 22 species from 8 subgenus in 6 genus were collected from three sites in Menglian and Lancang counties from June to October,2010.Aedes albopictus was the predominant species in three sites,accounting for 33.82% of all captured mosquitoes.No Ae.aegypti mosquitoes were found in these field sites.The average house index(HI),container index(CI),breteau index(BI),and thousand-person index of Ae.albopictus was 19.3,5.84,30.3,and 68.5 respectively.The dominant Ae.albopictus breeding environments were thick bamboo tubes,amphora,and used tires,accounting for 34.1%,27.5% and 17.6%,of positive water containers,respectively.The average population density of Ae.albopictus adults was 8.98 per person per hour.The density peaked in July and August.Dengue virus was not identified by RT-PCR from 29 batches of Ae.albopictus.Conclusion Local dengue fever surveillance should be strengthened due to high vector density and wide distribution of Ae.albopictus in these areas.