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Prevalence of A, symptomatic diarrhea and B, protozoan infection over the duration of the study, western Panamá. Prevalence with 95% confidence intervals are presented for each sample period for children from dispersed (dark gray) and dense (light gray) households. Household density was classified as dispersed if < 50 houses/km2 (n = 178–200 children) or dense if > 50 houses/km2 (n = 45–60 children).
