Fig 2. Comparison of the impact of individual control measures implemented during the St. Lucia study.

The effects of provision of water, of focal and area-wide snail control via mollusciciding, and of targeted chemotherapy in reducing S. mansoni incidence per annum, prevalence, and mean infection intensity (for those with egg-positive stools). Relative reductions over the initial 3–5 year course of each intervention are shown (as percentages) indicated by the horizontal bars. Data from [1, pp. 270–271].