Schistosoma mansoniin St. Lucian and Kenyan communities—a comparative study using the Kato stool examination technique

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Abstract
Quantitative Kato thick smears were prepared from the stools of about 2/3 of the population of La Caye village in St. Lucia; 62% were infected with S. mansoni and the arithmetic mean of egg output of the 365 persons examined was 311/g of feces. In a comparable village survey in Kenya, a prevalence of 82% among 416 people was found, with an arithmetic mean of 499/g of feces. In Kenya children were infected at an early age and peak prevalence in both sexes was in the 10-19 and 30-39 yr age groups in Kenya and St. Lucia, respectively. The study provides no evidence that in St. Lucia S. mansoni intensities of infection are low, as previously suggested. The rate of hepatosplenomegaly in endemic areas appears to be similar in both countries.

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