Abstract
The ability of nifluridide to kill reduviids was assayed in mice fed 7 ppm in diet and on cattle injected subcutaneously at 5 mg/kg body weight. Nifluridide was systemically active against Triatoma infestans on mice and Rhodnius prolixus on cattle. No effects on Trypanosoma (Schizotrypanum) cruzi could be detected in the intestinal contents of Triatoma infestans killed by the compound. In vitro and in vivo studies were conducted to determine the effects of nifluridide on trypanosomes growing in medium and in experimentally infected mice. Culture forms of Trypanosoma cruzi grown at 27 degrees C that are morphologically similar to epimastigotes found in infected bugs were affected by 2.5 to 10 ppm in the medium. Mice fed nifluridide in the diet simultaneous with infection of Trypanosoma cruzi or Trypanosoma (Herpetosoma) musculi exhibited parasitemias and tissue infections similar to nontreated infected mice. At the concentration tested, bloodstream trypomastigotes and culture epimastigotes of Trypanosoma musculi were unaffected by nifluridide. Only the culture epimastigotes of Trypanosoma cruzi were affected by the drug but not the bloodstream and tissue forms.
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