Endemic Ehrlichia canis infection in a dog from Ireland: case report

Abstract Background Canine monocytic ehrlichiosis, caused by Ehrlichia canis , is a tick-borne disease of dogs. We report the first confirmed case of endemic Ehrlichia canis infection in a dog from Ireland, with no travel history. Case presentation A six-year-old female neutered lurcher, presented with chronic fever, lethargy, polyuria, polydipsia, weight loss, thrombocytopenia, non-regenerative anaemia, hyperglobulinaemia, proteinuria, and ocular abnormalities including chorioretinitis and partial retinal detachment. Diagnosis was confirmed by enzyme-linked immunosorbent assays, indirect fluorescent antibody, and polymerase chain reactions. Treatment consisting of doxycycline with systemic corticosteroids resulted in resolution of associated clinical and clinicopathological abnormalities. Conclusions This case underscores the importance of comprehensive diagnostics, tick surveillance, and a One Health approach to identify, prevent, and manage vector-borne pathogens in Ireland. The presence of potentially endemic Ehrlichia canis in this dog raises concern for local transmission, potentially via Rhipicephalus sanguineus tick.