Volume s1-31, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



In this work, , n. sp., has been described. This human parasite, found in the River Ariari Valley, Colombia, is characterized by an average size of 31 microns (in blood films), a nucleus anterior to the equator of the body, and a round, small, subterminal kinetoplast. shows division stages in the peripheral blood. Until now we have not found evolutionary forms in the viscera or tissues of experimental animals. and the domestic dog have also been found naturally infected with is experimentally infected quite easily with this protozoon. Also is cultivated without difficulty.

So far, using parasites grown in cultures, we have only succeeded in infecting a few baby mice, two opossums (), one rhesus monkey and human volunteers. During the period of observation (11 and 15 months) the experimental infection followed an asymptomatic course in the two volunteers in whom the infection was established.

The frequency of human cases infected with in the Ariari Valley seems to be high. Out of 183 persons examined by blood cultures, 67 showed trypanosomes. It was possible to study completely the parasites isolated from 27 of these 67 infected people. The results were: 1 case with a mixed infection of both and , and 26 cases with single infections.


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