Seroprevalence of Anaplasma phagocytophilum, Ehrlichia spp. and Borrelia burgdorferi infections in horses: first report from Northern Bulgaria – Short communication
Lyme borreliosis, granulocytic anaplasmosis and monocytic ehrlichiosis are well studied in humans and dogs. In horses, these diseases are not widely investigated and limited information is available about their occurrence. The purpose of this study was to present the first ELISA-based report on the seroprevalence ofAnaplasma phagocytophilum, Ehrlichiaspp. andBorrelia burgdorferiin horses from Northern Bulgaria. A total of 192 horses were investigated from three regions in Northern Bulgaria (Northwestern, North-Central and Northeastern Bulgaria). All equine sera were tested forA. phagocytophilum, Ehrlichiaspp. andB. burgdorferiantibodies by a commercial rapid ELISA test. Antibodies againstA. phagocytophilumwere found in all the three regions at a mean frequency of 12% (23/192), ranging from 9.38 to 15.63% by region. Antibodies againstEhrlichiaspp. were found in horses from one region (Northeastern) at a rate of 0.5% (1/192). Anti-B. burgdorferiantibodies were detected in all the three regions with a mean frequency of 15.1% (29/192), ranging from 14.06 to 17.19% by region. A co-exposure toA. phagocytophilumandB. burgdorferiwas observed in 6.3% of the cases (12/192). This is the first report on the natural exposure of horses to these bacteria (A. phagocytophilum, Ehrlichiaspp. andB. burgdorferi) in Northern Bulgaria.