Estudo de infecções experimentais por Trypanosoma (Duttonela) vivax Ziemann,1905, em animais domésticos

Abstract

Experimental studies were carried out in cattle, sheep, goats and a horse with Trypanosoma (Dutonella) vivax Ziemann, 1905, obtained in a blood sample from a buffalo (Bubalis bubalis L.) naturally infected and reared in the Amapa Territory, Brazil. The patogenicity of this strain was studied by way of the clinical picture and pathology. Daily blood-smears, revealed varying parasitaemia in the majority os animals inoculated, and especially in the ruminants. The clinical picture most frequently observed included: intermittent febrile peaks, lacrimation, nasal discharge, anaemia, oedemas, progressive emaciation and cachexia. Circular structures (probably nuclei and kinetoplasts of degenerated trypanosomas) were encountered in organs such as liver and kidney; this could be of help in post-mortem diagnosis. The most obvious pathological changes observed were 64 generalized edemas, accompanied by complete cachexia. Experimental transmission by means of laboratory reared Stomoxys calcitrans was unsuccesful.