Abstract
A technique is described for quantifying the in vitro penetration of vertebrate cells by trypomastigotes of Trypanosoma cruzi. It was found that the parasites are distributed among host cells in a manner described by the negative binomial distribution. The rate at which trypomastigotes penetrate bovine embryonic skeletal muscle cells (BESM) decreased exponentially in time in this system. The rate of the exponential decrease was dependent upon the concentration of parasites, being faster for more concentrated suspensions of trypomastigotes. A significantly lower penetration rate of canine kidney and HeLa cells was found when compared to bovine embryonic skeletal muscle cells. Within a single population of BESM cells, the smaller cells were penetrated more rapidly than the larger ones per unit cell area.
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