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Revised study design for Schistosomiasis Consortium for Operational Research and Evaluation’s Niger Schistosoma haematobium control studies. CWT or C = community-wide treatment; H = drug holiday—a year when no praziquantel mass drug administration (MDA) was provided; SBT or S = school-based treatment; x1 = one MDA per year in years 3 and 4; x2 = two MDAs per year in years 3 and 4.
