Feces of 34 dogs out of 251 (13.5%) from guanabara were positive for Isospora. From these 19 (7.5%) were i. rivolta, 13 (5.2%) were I. canis and 2 (0,7) were i. bigemina. "Free-sporocysts" of I. rivolta were eliminated by 9 dogs (3.5%). A "Caryospora-like" oocyst was seen once. Cross-infection experiments performed with Isospora from dogs and cats failed to produce infection while inoculations of these Isospora in their natural hosts succeeded. The results suggest that the species of Isospora occurring in cats are different from those of dogs.
Dos 251 cães da Guanabara examinados 34 (13,5%) foram positivos para Isospora. Desses, 19 (7,5%) foram positivos para I. rivolta, 13 (5,2%) para L. canis e 2 (0,7%) para I. bigemina. "Esporocistos livres" de I. rivolta foram eliminados por 9 cães (3,5%). Foi visto uma vez um oocisto do tipo "Caryospora". Infecções cruzadas realizadas com Isospora de cães e gatos tiveram sempre resultados negativos, enquanto que resultados positivos foram obtidos quando oocistos das mesmas espécies, submetidos às mesmas condições, eram inoculados nos seus hospedeiros naturais. Os resultados sugerem que as espécies de Isospora que ocorrem nos gatos são diferentes das do cão
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