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Myocarditis in Sibling Boxer Puppies Associated with Citrobacter koseri Infection

Abstract

Two sibling Boxer puppies presented with severe suppurative myocarditis in the absence of additional disseminated suppurative foci. The identification of gram-negative bacteria within areas of myocarditis in both puppies and the pure growth of large numbers of Citrobacter koseri from the myocardial lesions in one of the dogs were consistent with a bacterial etiology. The fact that C. koseri is an opportunist pathogen suggested intercurrent immunosuppression. The finding of a concomitant bacterial myocarditis in two canine siblings is novel. The case is also unusual in that syncope could be related to the myocardial injury.

Key words: Boxer, Citrobacter koseri; dogs, myocarditis, syncope.

Request reprints from Dr. J. P. Cassidy, Department of Veterinary Pathology, Faculty of Veterinary Medicine, University College Dublin, Ballsbridge, Dublin 4 (Ireland). E-mail: joseph.cassidy{at}ucd.ie.