A 12 yr old Dalmatian was referred for evaluation of acute lethargy, fever, neurologic signs, and a recently ausculted heart murmur. Echocardiography in combination with blood cultures resulted in a diagnosis of nonhospital-acquired Serratia marcescens bacteremia and aortic valve endocarditis. Despite early diagnosis and aggressive therapy, the dog failed to respond to antimicrobials and died within 6 hr after admission. Necropsy findings included aortic valve endocarditis, septicemia, and diffuse thromboembolic disease. There was no history of pre-existing underlying disease or immunosuppressive therapy, and the dog had not been hospitalized before referral.

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