Figure 1

Age group variation in gametocyte density with corresponding infectiousness to mosquitoes. Data shown in Table 1. The higher minus the lower 95% confidence intervals are taken as a measure of gametocyte density variation and are normalized within each study area by dividing by the lowest value, thus giving the lower value of 1. Circles – P. vivax Sri Lanka [9]; Triangles – P. falciparum Sri Lanka [9]; Squares – P. falciparum Kenya [10]; Crosses – P. falciparum Cameroon [11].