Abstract:

Objective To investigate the distribution of mosquito vectors of dengue fever in Sichuan province for providing data for the prevention and control of the epidemic. Methods Surveillance on the vector of dengue fever, Aedes albopictus, was conducted all over the province from 2008 to 2009, with the dengue virus isolated and the density of mosquito vectors analyzed. Results Statistics showed that the container index (CI) of 19 surveillance sites was 24.05% with an adult Ae. albopictus density of 5.69 per person per hour. It was seen that waste tyres had a highest CI (48.77%), followed by some special places which had a CI and density of Ae. albopictus of 40.74% and 15.32 per person per hour, respectively. The peak CI appeared in July (30.60%), with the peak density of adult Ae. albopictus observed in August (7.94 per person per hour). It was found that the Ae. albopictus was the predominant species in most surveillance sites, with the composition ratio being between 26.88%-98.37%. There was a regional but not geographical location difference in the density of Ae. albopictus in the 19 surveillance points. No Ae. albopictus was found in the south of Ganzi prefecture. A sample of 4470 adult Ae. albopictus was collected in Longchang county, Neijiang city with no dengue viruses isolated from them. Conclusion There exists an extensive distribution of Ae. albopictus in the Szechwan Basin. An epidemic outbreak may occur once there is a case of dengue fever in the area. So surveillance on dengue needs to be strengthened.

Key words: Mosquito vectors, Dengue fever, Surveillance

摘要：

目的 调查四川省登革热媒介伊蚊的分布情况，为登革热的防治提供依据。方法 对全省2008－2009年登革热媒介伊蚊进行监测，分析蚊虫密度，分离登革热病毒。结果 19个监测点蚊幼虫的容器指数为24.05%，白纹伊蚊总密度为5.69只/人工小时。以废旧轮胎容器指数最高，为48.77%; 特殊场所蚊幼虫容器指数和成蚊密度均较高，分别为40.74%和15.32只/人工小时; 容器指数高峰在7月为30.60%，成蚊密度高峰在8月为7.94只/人工小时; 白纹伊蚊是大多数监测点的优势蚊种，构成比在26.88%～98.37%之间; 19个监测点白纹伊蚊的密度有地区差异，但无地理位置差异。甘孜州南线未发现伊蚊。内江市隆昌县采集的白纹伊蚊成蚊标本4470只，未分离出登革热病毒。结论 白纹伊蚊在四川盆地分布广泛且密度较高，一旦有登革热病例输入，有可能造成疫情扩散。

关键词: 蚊媒, 登革热, 监测