Fig 3. Prevalence of intestinal schistosomiasis and sensitivity of the Kato-Katz method, according to the number of examined slides and stool samples.

Prevalence of Schistosoma mansoni infection (white bars), as determined by the analysis of one fecal sample with two (SPL1 K1-K2), six (SPL1 K1-K6), 12 (SPL1 K1-K12) or 14 slides (SPL1 K1-K14), or obtained with the analysis of two slides prepared from each of three fecal samples (SPL1-3 K1-K2). The sensitivity of the different numbers of Kato-Katz slides examined (black bars) was calculated in relation to the reference standard, which included the combined results of 18 Kato-Katz slides, the saline gradient, and the Helmintex methods.