Article
Polymorphism in Trypomastigotes of Trypanosoma (Megatrypanum) minasense in the Blood of Experimentally Infected Squirrel Monkey and Marmosets
Registro en:
ZICCARDI, Mariangela; OLIVEIRA, Ricardo Lourenço de. Polymorphism in Trypomastigotes of Trypanosoma (Megatrypanum) minasense in the Blood of Experimentally Infected Squirrel Monkey and Marmosets. Memórias do Instituto Oswaldo Cruz, Rio de Janeiro, v. 94,n. 5, p. 649-653, Sept./Oct. 1999.
0074-0276
10.1590/S0074-02761999000500016
1678-8060
Autor
Ziccardi, Mariangela
Oliveira, Ricardo Lourenço de
Resumen
Experimental infections by Trypanosoma (Megatrypanum) minasense were performed in primates -
Saimiri sciureus and Callithrix penicillata - with the objective of searching for morphological variations
of the blood trypomastigotes with respect to hosts and time of infection. We carried out morphological
and morphometric analysis of blood trypomastigotes. Illustrations are given.
Both the squirrel monkey and marmoset became infected after the injection of blood trypomastigotes
of T. minasense, although the parasitaemia were briefer in the squirrel monkey. The parasites detected
in the later host were narrower and shorter than those found in the inoculated marmoset. In the marmoset, the blood stream parasites derived from culture metacyclic trypomastigotes were considerably smaller
than those derived from the inoculation of infected blood.
Stronger evidence of polymorphism was found when, at the same time of infection, the blood
trypomastigotes found in squirrel monkey had smaller length, body width and the distance from posterior end of the body to the kinetoplast almost four times smaller than the parasite found in the marmoset. Therefore, conflicting results on morphology and morphometry of T. minasense obtained by previous investigators could be due to polymorphism.