The aim of the study was to establish the prevalence of Ehrlichia canis, Anaplasma phagocytophilum and Borrelia burgdorferi in dogs in eastern Poland and to determine the factors associated with exposure (seroposity) or infection (PCR). Anti-A. phagocytophilum, anti-B. burgdorferi and anti-E. canis antibodies were determined in 400 dogs, using the SNAP 4Dx ® test (IDEXX Laboratories). In addition, PCRs were performed for the detection of E. canis, A. phagocytophilum and B. burgdorferi DNA. In reference to the risk factor analysis, a regression logistic model was determined for each aetiological agent. The overall seroprevalence was highest for B. burgdorferi (11.0 %), followed by A. phagocytophilum (8.0 %) and E. canis (1.5 %). Eleven healthy dogs were found to be infected with A. phagocytophilum, as determined by PCR, while the remainder were seronegative. For B. burgdorferi, the DNA of the spirochetes was detected in the blood of 20 dogs, while the presence of anti-B. burgdorferi IgG was detected in the sera of ten of these. For E. canis, none of the dogs tested positive by PCR. Tick control was included as a protective factor for A. phagocytophilum and B. burgdorferi, while the origin (rural) was included as a risk factor for B. burgdorferi and A. phagocytophilum infection. In addition, breed (pure) was a risk factor for B. burgdorferi infection, and sex (female) was a risk factor for E. canis.
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