Volume 57, Issue 5
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



A combined epidemiologic and malacologic survey of schistosomiasis in Puerto Rico was carried out in areas where previous surveys had reported the prevalence of the disease. This limited survey, with 495 persons examined, found a low prevalence (0.6%) of infections. The infections were restricted to three people more than 36 years of age. No infections were detected in children 16 years of age or less, and this cohort comprised 57.8% of the study group. Malacologic surveys of the four streams, 10 rivers, and eight lakes throughout the island revealed the absence of intermediate host and the presence of , a competitive species of and the predatory snail . We believe that the absence of is the primary reason for the sustained reduction in the prevalence of schistosomiasis in Puerto Rico.


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