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Subspeciation of penicillin susceptible alpha-hemolytic streptococci is not routinely performed. However, Streptococcus MG-intermedius is an extremely virulent organism in this strep subgroup and is associated with abscess formation. Our patient, who had endocarditis due to this organism, remained chronically ill despite appropriate antibiotic therapy, and had a perforated aneurysm of the sinus of Valsalva with a myocardial abscess that required extensive surgical debridement. Persistent fever in patients with S MG-intermedius endocarditis should warrant further work-up for metastatic or myocardial abscess formation.
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