Fig. 2From: Efficacy, persistence and vector susceptibility to pirimiphos-methyl (Actellic® 300CS) insecticide for indoor residual spraying in ZanzibarMosquito mortality rate on wall substrates (a) in Unguja and (b) in Pemba throughout the study period. The dashed line represents the WHO threshold of 80 % mosquito mortality rateBack to article page