Abstract
Examination of 343 Colombian monkeys and marmosets, belonging to 18 species, revealed a 30·6% prevalence of Trypanosoma cruzi cruzi infection. Ateles fusciceps, Cebuella pygmaea, Lagothrix lagotricha, Saguinus mystax and S. oedipus are reported as new hosts for the parasite. Only one Ateles geoffroyi of 79 monkeys from northern Colombia was infected; the highest infection rate occurred in southwestern Colombia, where 25% of the primates examined harboured T. c. cruzi. Cultures of the trypanosomes produced low parasitaemia and no death in inoculated mice, but fully protected them against subsequent challenge infection with the highly virulent Tulahuen stock of T. c. cruzi. Intracellular amastigotes were found in the heart muscle of three naturally infected Cebus monkeys and in 12 mice inoculated with trypanosomes isolated from monkeys.
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