Figure 2

Seasonality, entomology and timing of the intervention. Rainfall data is given in the dashed line in mm/week; the average number of female anophelines caught per night in five sentinel houses in Kiruani is represented by solid diamonds; the average number of female anophelines caught per night in ten sentinel houses in Magadini and Korongo is represented by open diamonds. The drug intervention was completed 3-5 weeks before the start of the rains in early April.