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Prevalence of infection with the intestinal helminths, Ascaris lumbricoides, Trichuris trichiura, Ancylostoma duodenale and Strongyloides stercoralis was examined in 632 residents of communities in Esmeraldas Province of Ecuador. These communities were divided into two groups according to area of habitation which reflected different socioeconomic circumstances. Attempts were made to correlate infection status with race and ABO blood group phenotype. The racial groups included blacks, Chachi amerindians, and mixed-race mestizos. Greater prevalences of infection were seen in the area of lower socioeconomic status. No racial or blood group associations with helminth infection were seen controlling for socioeconomic status.

Intestinal helminthiases in Ecuador: the relatíonship between prevalence, genetic, and socioeconomic factors