摘要: The literature on the diseases caused byTrypanosoma evansi is reviewed and gaps in available information are emphasized.Trypanosoma evansi, basis of combined similarities morphology, biological behaviour, to some degree based geographical distribution, a species closely related probably originating fromT.brucei. distribution ofT. evansi very wide Old New World it transmitted by biting flies vampire bats. It has patchy any region new foci infection have high incidence. Diagnosis made demonstration trypanosomes, biochemical tests detecting increase serum proteins, specific serological tests. clinical signs vary with acuteness syndrome, often being characterized chronic course lack pathognomonic signs. There little pathology various animals, but lesions apper be similar those byT. brucei associated trypanosomes solid tissues. Immunological studies habe been limited primarily serology connection diagnostic procedures. Laboratory models studied syndromes produced byT.brucei. Chemotherapy varied dependent host. More incidence severity required identify priorities for further research.