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  • Title: Comparative synergistic activity of nafcillin, oxacillin, and methicillin in combination with gentamicin against.
    Author: Glew RH, Millering RS, Wennersten C.
    Journal: Antimicrob Agents Chemother; 1975 Jun; 7(6):828-32. PubMed ID: 1155924.
    Abstract:
    The effectiveness of three semisynthetic, penicillinase-resistant penicillins alone and in combination with gentamicin was tested against 29 clinical isolates of enterococci. The minimal inhibitory concentrations of nafcillin were considerably lower than those of oxacillin and methicillin but were slightly higher than those of penicillin. At clinically achievable concentrations, the combination of nafcillin plus gentamicin produced enhanced killing against 13 of 14 strains of enterococci and was synergistic (by very rigid criteria) against 10 of 14 strains. In contrast, combinations of oxacillin plus gentamicin were synergistic against only 3 of 14 strains, and methicillin plus gentamicin produced synergistic killing against only 1 of 14 strains.
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