Toxoplasma gondii infection in Amerindians of the Venezuelan Amazon.

We conducted a serological survey for Toxoplasma gondii in 121 Amerindians of the Guajibo ethnic group, 4 to 45 years of age, inhabiting Amazonas Stat e, in the Venezuelan rain forest. The overall prevalence was 88%. Pattern o f prevalence and antibody titres were compatible with constant transmission . Sex differences in antibody prevalence were not detected but antibody tit res were significantly higher in females. The study is consistent with the presence of risk factors, which favour a frequent exposure of these Amerind ians to T. gondii since childhood.