Abstract:

Objective To investigate the density of mosquitoes in Yangzhou city, to compare the results between the mosq-ovitrap method and Breteau Index (BI) method and to provide the scientific evidence for prevention and control of dengue. Methods A mosq-ovitrap was set every 25-30 meters in a hidden and shady places in the surroundings of urban and rural areas. Adult and larval Aedes mosquitoes were collected and identified simultaneously for BI around the mosq-ovitrap set. Results In total, 150 and 50 mosq-ovitraps were set and 137, 50 were collected with 4, 3 positive traps respectively in different surrounding of urban and rural areas. The Mosq-ovitrap Index were 2.92, 6.00 respectively. At the same time, water containers in 105 and 50 households were checked around the mosq-ovitrap set, in which 11 and 8 containers were positive. The BI were 10.48 and 16.00, respectively. Based on statistical analysis, BI were higher than the Mosq-ovtrap index between which the difference was statistically significant (χ²=8.840, P=0.003). Conclusion In urban or rural areas, BI that is greater than 5 and less than 20 which indicates a relatively safe condition. The mosq-ovitrap method differs from BI method in dengue vector surveillance in this area.

Key words: Aedes mosquito density, Mosq-ovitrap index, Breteau index

摘要：

目的 了解扬州市登革热蚊媒密度及分布情况, 探讨诱蚊诱卵器法与布雷图指数法监测效果, 为登革热的防制提供科学依据。方法 在城区和农村地区的不同环境, 每25～30 m布放1个诱蚊诱卵器, 收集捕获的成蚊和蚊幼虫;同时检查并记录布放点周围室内外所有积水容器中伊蚊幼虫孳生情况和周围的成蚊, 并对其进行收集和种类鉴定, 计算布雷图指数。结果 在城区和农村地区不同类型外环境中分别布放诱蚊诱卵器150个和50个, 有效回收137个和50个, 阳性诱蚊诱卵器数分别为4个和3个, 诱蚊诱卵器指数为2.92和6.00;调查城区和农村不同环境105户和50户的蚊虫孳生容器, 伊蚊阳性容器数分别为11个和8个, 布雷图指数分别为10.48和16.00;布雷图指数高于诱蚊诱卵器指数, 且差异有统计学意义(χ²=8.840, P=0.003)。结论 在城区或是农村地区, 5<布雷图指数<20, 处于相对安全状态;在登革热媒介监测中, 诱蚊诱卵器法与布雷图指数法监测结果存在差异。

关键词: 伊蚊密度, 诱蚊诱卵器指数, 布雷图指数