Abstract
This study evaluated the infection caused by Rickettsia spp. among dogs and horses from Mato Grosso State. A total of 384 dogs and 460 horses were tested by the Indirect Immunofluorescence Assay (IFA) for Rickettsia rickettsii, Rickettsia parkeri, Rickettsia amblyommii, Rickettsia rhipicephali and Rickettsia bellii Overall, 3.12% (12/384) of the dogs were seroreactive for at least one Rickettsia species. A total of 7 (1.82%) canine sera showed titers to R. bellii at least 4-fold higher than those to any of the other rickettsial antigens, allowing us to consider that these dogs were infected by R. bellii . In horses, 273 (59.34 %) samples were positives for at least one antigen tested, and highest anti- Rickettsia spp. endpoint titers were observed for R. amblyommii , suggesting homologous reactions to this agent or a very closely related organism. The results showed that dogs are under low exposition to ticks infected with spotted fever group Rickettsia , indicating low risk of human infection by these agents. However, R . amblyommii is widely distributed in the State.
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