Fig. 4From: Modelling control of Schistosoma haematobium infection: predictions of the long-term impact of mass drug administration in AfricaMDA effect on SWB strata. An MDA applied to SWB population would rearrange variables {h k } by shifting higher-burden stratum h k  → h ε k , depending on drug efficacy ε (worm survival rate after treatment), and treatment coverage fraction, f. The plot shows the predicted effect of different coverage fractions (f = 50 %, 90 %) on a typical SWB distribution, assuming ε = 0.75Back to article page