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Abstract
Two hundred and five Yakima Indians (age range: one to 66 years) were examined for parasitic infections, and various environmental exposures to infection. A questionnaire was completed by each participant and an anal swab, blood specimens and a single faecal sample were obtained. Eight of 181 swabs (4·4%) contained eggs of Enterobius vermicularis. Of 89 faecal specimens submitted, 12 (13·5%) and 1 (1·1%) respectively contained Giardia lamblia and Cryptosporidium. Sera were screened for antibodies to Toxocara canis, Echinococcus granulosus and Toxoplasma gondii, utilizing enzyme immunoassay, indirect haemagglutination (IHA) and indirect fluorescent antibody tests respectively. Toxocara seroprevalence was 31% (38/123). Seven of 39 (18%) sera were reactive to E. granulosus antigen in the IHA test, but none was positive for arc 5 antigen in the double immunodiffusion test. The seroprevalence of T. gondii was 20% (23/114).