STUDIES ON BACTERIA DEVELOPING RESISTANCE TO PENICILLIN FRACTIONS X AND G IN VITRO AND IN PATIENTS UNDER TREATMENT FOR BACTERIAL ENDOCARDITIS

^{George Washington Medical Division, Gallinger Municipal Hospital, Washington}

^{Department of Medicine, George Washington University, Washington}

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^{George Washington Medical Division, Gallinger Municipal Hospital, Washington}

^{Department of Medicine, George Washington University, Washington}

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^{George Washington Medical Division, Gallinger Municipal Hospital, Washington}

^{Department of Medicine, George Washington University, Washington}

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