Fig. 4
Estimated proportion of attacks on humans versus cattle when offered a choice between one of each host species (mean and 95% confidence intervals) for Anopheles funestus s.s. and Anopheles arabiensis in Segera, northern Tanzania [22], and Zimbabwe (data extracted from Fig. 7 in reference [30]) compared to those obtained by this study in southern Tanzania. The estimated proportion of attacks on humans (Ph) was calculated as follows for the historical Tanzanian example, based on published estimates for the relative availability of humans versus cattle (λ): Ph = 1/(1 + λ) [61]