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Kaplan–Meier plot showing the time needed for Schistosoma haematobium–endemic shehias on Zanzibar to reach a zero-prevalence status among 9- to 12-year-old children, stratified by intervention arm. Shown separately are the rates for communities given biannual mass drug administration (MDA)–only (26 events in 38 eligible schools), biannual MDA + snail control (21 events in 37 eligible schools), and biannual MDA + behavior change interventions (24 events in 38 eligible schools).
