Infection remains a major problem in the early phase after heart transplantation. Immunosuppressive therapy is the most important predisposing factor. It may also reactivate preexisting latent endogenous infections. Unspecific symptoms and a chronic clinical course, as described in this report, may suggest infective endocarditis of the cardiac allograft. From this case, we do not suggest a general antibiotic prophylaxis for heart transplant recipients; however, special precaution should be considered in heart transplant patients with a history of endocarditis.