A 6 yr old female spayed large Munsterlander was evaluated following a 3 wk history of lethargy, inappetence, intermittent fever, and a recent change to the timing of her previously diagnosed heart murmur. Physical examination revealed marked dehydration, lethargy, and a grade 5/6 to-and-fro heart murmur that was auscultated best at the right sternal border. The dog was febrile, and echocardiography revealed a large, mobile, vegetative lesion in the right ventricular outflow tract associated with a ventricular septal defect (VSD). Mild aortic insufficiency was present. Corynebacterium mustelae (C. mustelae) was isolated from a pooled blood culture. Treatment of infective endocarditis (IE) was initiated along with supportive care, and the patient was discharged 9 days later. The dog remained without clinical signs 132 days after discharge. VSD is rarely mentioned as a predisposing factor for development of IE in veterinary literature; however, this report highlights that dogs with a VSD may be at risk for IE. To the authors’ knowledge, this is the first documented case of a canine infection with C. mustelae. Infection with C. mustelae in this case represents a novel agent for IE in the dog.
Mural Endocarditis Caused by Corynebacterium mustelae in a Dog With a VSD
Randolph L. Winter, Sonya G. Gordon, Shuping Zhang, Crystal D. Hariu, Matthew W. Miller; Mural Endocarditis Caused by Corynebacterium mustelae in a Dog With a VSD. J Am Anim Hosp Assoc 1 September 2014; 50 (5): 366–372. doi: https://doi.org/10.5326/JAAHA-MS-6016
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