关键词: 白纹伊蚊, 布雷图指数, 路径指数

Abstract: Objective To study on the applicability of the route index environment of city emergency monitoring of Aedes albopictus larvae, and provides scientific support for the prevention and control of Ae. albopictus. Methods Investigation was carried out in outdoor environments of 162 dengue fever outbreak regions (including the core area, warning area, monitoring area) of Hangzhou city in 2017 for Ae. albopictus larvae by Breteau index (BI) which were calculated by electronic map method and route distance conversion method. The impacts of BI calculated by two different methods were compared. The BI difference between the electronic map method and the path distance method was compared with the Wilcoxon paired test. The difference between the standard rate of the core area, the warning area and the monitoring area calculated by the electronic map method and the path distance method was compared with Chi square test. Results The median of BI in the electronic map method was 0.20, and the median of the route distance method BI was 1.60. The difference was statistically significant (Z=-8.191, P=0.000). The electronic map method and route distance method were used to calculate the rate reaching control level of Ae. albopictus in the core area, the warning area and the monitoring area (BI<5 is up to the standard). There was a statistically significant difference between the three regions in control rate calculated by the route distance method (χ²=8.509, P=0.011), and there was no difference between the three regions in control rate calculated by the electronic map method (χ²=0.867, P=1.000). BI<5, the Aedes emergency control level when dengue fever outbreak, was converted into the route index (RI) being RI <3.3 by means of route distance method, which was higher than the national standard GB/T 27771-2011 mosquito density control level C required RI ≤ 0.8. Conclusion The route index method is suitable for the emergency monitoring of Ae. albopictus in the urban environment and is more feasible. It can be an effective supplement to the BI method. The RI index in the national standard GB/T 27771-2011 can be used as the reference standard for the emergency control standard of dengue vector Aedes in the urban environment.

Key words: Aedes albopictus, Breteau index, Route index