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Distribution of individual egg reduction rates following a single treatment with 40 mg/kg of praziquantel against Schistosoma spp. For each trial, the individual egg reduction rates (iERRs) were calculated and grouped into four different drug efficacy categories. The iERRs were classified into being satisfactory (iERR ≥ 90%), doubtful (90 > iERR ≥ 80), reduced (80 > iERR ≥0) or negative (iERR < 0).
