Volume 6, Issue 4
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



During 1953 a single fecal sample from each of over 10,000 Puerto Rican school children was examined for helminth eggs, especially those of . The following average percentage rates of infection were found: , 10.0; hookworm ( and ), 17.1; , 92.6; , 20.3; and , 0.4. The incidence of in boys and girls was 12.5 and 8.1 per cent, respectively. This difference was significant at odds greater than 99:1. A high degree of correlation (r = 0.89) was found between the age of the boys and their rate of infection, while with the girls, these factors were not correlated (r = 0.38).

In general, the abundance of the snail vector () was related directly to the incidence of human schistosomiasis. There was little or no agreement between infection rates in snails and those in human beings at a given time in a particular locality. The epidemiological aspects of these findings are discussed in the light of results obtained from a study of human beings, snails and infections in three stream communities and from other studies in selected regions in Puerto Rico.


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