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Light microscopical structure and ultrastructure of a Besnoitia sp. in the naturally infected lizard Ameiva ameiva (Teiidae) from north Brazil, and in experimentally infected mice

Published online by Cambridge University Press:  28 November 2001

I. PAPERNA  and
R. LAINSON
I. PAPERNA
Affiliation:
Department of Animal Sciences, Faculty of Agriculture of the Hebrew University of Jerusalem, Rehovot 76–100, Israel
R. LAINSON
Affiliation:
Department of Parasitology, The Instituto Evandro Chagas, Caixa, Almirante Barroso 492, Belem 66090-000, Para, Brazil
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Abstract

A Besnoitia species of the teiid lizard Ameiva ameiva (L.), from north Brazil was established in laboratory mice and hamster by the intraperitoneal inoculation of bradyzoites in the tissue cysts. In the lizards all the cyst wall layers were closely apposed. In the mice the layers of the wall were distinguishable, and ultrastructurally the inner cytoplasmic layer contained either a tight network of endoplasmic reticulum or packed mitochondria or both. These components were less frequent or sparse in the inner cytoplasmic layer of cysts in the lizard. The only animals available for experiments in attempts to indicate the definitive host of the parasite were 3 kittens of the domestic cat and a juvenile specimen of the snake Boa constrictor raised in captivity. No evidence of infection could be detected in these animals after feeding them with the tissues of mice harbouring cysts with very large number of bradyzoites.

Keywords

Besnoitia sp.Ameiva ameivalizardmousetachyzoitesbradyzoitestissue cystsultrastructureBrazil
Type
Research Article
Information
Parasitology , Volume 123 , Issue 3 , March 2001 , pp. 247 - 255
Copyright
© 2002 Cambridge University Press

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