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Year 2013 - Volume 33, Number 6
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Frequency of Equine Monocytic Ehrlichiosis (EME) in Brazil, 33(6):697-699
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ABSTRACT.- Moreira L.M.C., Cardoso K.M., Aboud-Dutra A.E., Ferrão C.M. & Gazêta G.S. 2013. Frequency of Equine Monocytic Ehrlichiosis (EME) in Brazil. Pesquisa Veterinária Brasileira 33(6):697-699. Laboratório Referência Nacional em Vetores das Riquetsioses, Instituto Oswaldo Cruz, Avenida Brasil 4365, Rio de Janeiro, RJ 21040360, Brazil. E-mail: leonardo.moerbeck@ioc.fiocruz.br
From a cross-sectional observational study with convenience samples, 347 blood samples from horses were collected from different physiographic regions, as follows: Santa Catarina Plateau (Santa Catarina State - SC), Médio Paraíba do Sul (São Paulo State - SP and Rio de Janeiro State - RJ), Mountainous and Metropolitan regions (Rio de Janeiro State - RJ). Samples were tested for the presence of antibodies (IgG) anti Neorickettsia risticii by indirect immunofluorescence assay (IFA). The frequency obtained in this study corroborates with the ones obtained in the U.S.A., which refers to endemic regions. Fisher’s exact test showed significant differences in the number of positive animals between regions, indicating that the probability of an animal becoming infected varies depending on the area. The CI 95% revealed no association between infection and geopolitical space. Moreover, Odds ratio test showed differences of an animal getting infected in different regions. This event could be influenced by the type of treatment used in each area, as the seasonal frequency of injury or even potential vectors. Therefore, there are seropositive animals for N. risticii in the studied areas, suggesting that this agent may be circulating in those regions. Future studies mainly based on molecular analyzes are needed to confirm these serological findings. |
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