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Schistosoma haematobium prevalence and intensity in first grade, 9–12-year-old children, and 20–55-year old adults in the snail control arm in Zanzibar (overall and by island), at baseline in 2012 and end line in 2017. Bar charts present the S. haematobium prevalence. Dark gray parts with white numbers present the percentage of heavy infection intensity among the overall prevalence.
