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The collateral and extended effects of preventive chemotherapy, many of which were unanticipated, have reduced disease burdens and saved lives on a scale that appears to have exceeded the intended impact on seven neglected tropical diseases (NTDs) — the three major soil-transmitted helminth infections (ascariasis, trichuriasis, and hookworm infection), schistosomiasis, lymphatic filariasis, onchocerciasis, and trachoma.
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Hotez et al. (2019) studied this question.
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