Biomorphological characteristics of Trypanosoma evansi and T. theileri of some domestic animals
1987
Manuel, M.F. | Encomienda, I.Q. (Philippines Univ., Los Banos, College, Laguna (Philippines). Dept. of Parasitology)
Five hundred animals consisting of 100 cattles, 100 carabaos, 100 goats, 100 pigs and 100 dogs were examined for the presence of hemoflagellates employing microscopic examination of stained blood smears, culture method, and mouse inoculation. Of the 100 cattle and 100 carabao blood samples, 12 and 18, respectively, were positive for Trypanosoma theileri in culture of the 100 carabaos, 15 were positive for T. evansi infection. No trypanosomes were found in the blood of goats, pigs, and dogs. Three developmental stages were identified; their measurements were taken and recorded. Both cattle and carabaos were infected with T. theileri which multiply and can be maintained in culture for 12 days incubated at 37 deg C. T. theileri does not multiply in mice. The biotest results showed that carabaos are more commonly infected with T. evansi than cattle. The results of the present study also indicate that T. evansi of carabao origin increases in pathogenicity by mouse passages. The culture method for T. theileri and animal inoculation technique for T. evansi are more reliable than microscopic examination of wet and stained blood smears for the detection of trypanosomes in domestic animals.
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