Figure 1

Mean indoor and outdoor biting densities of An. gambiae at two sites in the Kilombero Valley in 1997 and 2004. Grey background shading represents the proportion of the human population in bed. Note these estimates reflect the biting rate experienced by a human landing catcher sampling exclusively indoors or outdoors, rather than the calculated biting rates experienced by a typical resident that are presented in figures 2 to 4 [see Additional file 1].