Figure 1.

Decline with time in treated nets efficacy. Mortality of An. gambiae Kisumu during overnight exposure to treated netting in tunnel test apparatus; Pyrimiphosmethyl was used at 150 mg/m²alone and combined with (a) DEET 10 g/m² and (b) KBR 10 g/m². Surimposed curves drawn according to sigmoidal time – response model of equation (3) whose parameters are shown in Table 1.