Abstract
ABSTRACT A study on equine theileriosis was carried out in the southern region of the Brazilian state of RioGrande do Sul (RS). Blood samples were collected from 113 mares from an equine breeding farmlocated in the city of Bage, latitude 31o30’ S and a longitude of 54U10’ W. The serological testing wascarried out with the use of indirect fluorescence test (IFAT) and compared with Nested PolimeraseChain Reaction (nPCR). Among the sera collected from 118 horses, 25 were found positive to Theileria equi by the IFAT, while by nPCR 17 positive for T. equi was observed, corresponding to afrequency of 22.1% and 15.0%, respectively. The racial analysis showed 15.05% (14) thoroughbredand 55% (11) Crioulo breed horses to be positive by IFAT. Key words: Theileria equi, IFAT, prevalence. INTRODUCTIONEquine piroplasmosis, caused by Theileriaequi and Babesia caballi , is considered to be themost important tick-borne disease of horse intropical and subtropical areas 1 . Clinicalmanifestation of the disease is variable includingfever, anemia, icterus, lethargy, and in somecases death
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