Serum samples from 397 horses were examined by the indirect immunofluorescence technique. The blood samples were taken from horses of various ages, breeds and both sexes, bred and born in the Santa Catarina State, Brazil, in the counties of Lages, São Joaquim, Bom Jardim da Serra, Campos Novos, Anita Garibaldi, Curitibanos e Correia Pinto. The results indicated a prevalence of 50.38% of positive animals for B. equi at the 1:40 serum dilution. In different counties studied, the prevalence positive animals varied from 18.51% to 64.70%.
prevalence; Babesia equi
