Resumen

GOMEZ-PINERES, Ely et al. Comparative Morfometric of five Venezuelan Trypanosoma vivax isolates. Rev. Fac. Cienc. Vet. [online]. 2014, vol.55, n.1, pp.25-33. ISSN 0258-6576.

Trypanosomosis caused by Trypanosoma vivax (T. vivax), is distributed in tropical and subtropical regions of Africa, Latin America and Asia, causing great economic losses. Previous biometric analysis report that T. vivax measures between 18 and 31 µm; but few such studies have been conducted in Venezuela. The aim of this study was to describe and compare the morphometry of five isolates of T. vivax, to demonstrate the variability in size of the protozoa obtained from naturally-infected cattle in different geographical areas of Venezuela. To accomplish this, experimental infections were induced in sheep and blood samples were taken at the first peak of parasitemia. Micrographs of stages of hematozoa (20 micrographs of each specimen using scanning electron microscopy) were recorded for morphological studies. The results of this research revealed significant (p<0.05); (p<0.01) statistical differences in length among them. The total average length was 20.99 ± 2.10 µm, with variations which ranged from 18.12 ± 4.42 µm, for smaller lengths, and 24.35 ± 5.55 µm, for greater lengths, respectively. Therefore, the existence of variability in the size of these hemoparasites in Venezuela was demonstrated.

Palabras clave : Trypanosoma vivax; cattle; scanning microscopy; trypanosomosis; Venezuela.

        · resumen en Español     · texto en Español     · Español ( pdf )