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

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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.

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