Fig. 3From: Indoor residual spraying practices against Triatoma infestans in the Bolivian Chaco: contributing factors to suboptimal insecticide delivery to treated householdsFrequency distribution of alpha-cypermethrin a.i. concentrations on filter papers collected from IRS-treated houses (n = 57 houses). The vertical lines represent the alpha-cypermethrin a.i. concentration target range (50 mg ± 20% a.i./m2)Back to article page