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Treatment of bacterial endocarditis with vancomycin

Five patients with bacterial endocarditis who were allergic to penicillin were treated successfully with vancomycin. The causative microorganisms were Streptococcus bovis, S faecalis, S agalactiae, S intermedius, and Staphylococcus aureus. Except for the strain of S faecalis, vancomycin was bactericidal against these organisms at easily achievable serum concentrations. To insure a bactericidal serum titer of 1:8 or greater, streptomycin was added in the therapy of the case caused by S faecalis. There was no toxicity from vancomycin therapy in our patients except for mild phlebitis at the infusion site. Vancomycin appears to be an effective alternative to penicillin in individuals with endocarditis due to susceptible organisms. Vancomycin in combination with an aminoglycoside may be appropriate therapy for enterococcal endocarditis.