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Proportion of Plasmodium falciparum infections stratified by school, treatment status, and detection method. Low, seasonal-transmission schools (Bvumbwe and Ngowe) infections detected by microscopy (A) and polymerase chain reaction (PCR) (C). High-transmission schools (Maseya and Makhuwira) infections detected by microscopy (B) and PCR (D). Treated students, solid lines; untreated students, dashed lines. Error bars are 95% Confidence Intervals.
