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ID: ALA1649147

Journal: Antimicrob Agents Chemother

Title: Antistaphylococcal activity of dihydrophthalazine antifolates, a family of novel antibacterial drugs.

Authors: Clark C, Ednie LM, Lin G, Smith K, Kosowska-Shick K, McGhee P, Dewasse B, Beachel L, Caspers P, Gaucher B, Mert G, Shapiro S, Appelbaum PC.

Abstract: For a panel of 153 Staphylococcus aureus clinical isolates (including 13 vancomycin-intermediate or heterogeneous vancomycin-intermediate and 4 vancomycin-resistant strains), MIC(50)s and MIC(90)s of three novel dihydrophthalazine antifolates, BAL0030543, BAL0030544, and BAL0030545, were 0.03 and 0.25 microg/ml, respectively, for methicillin-susceptible strains and 0.03 and 128 microg/ml), although rates of endogenous resistance development were much lower for the dihydrophthalazines than for trimethoprim. Single-step platings of naïve staphylococci onto media containing dihydrophthalazine antifolates indicated considerable variability among strains with respect to preexistent subpopulations nonsusceptible to dihydrophthalazine antifolates.

CiteXplore: 19188385

DOI: 10.1128/aac.01619-08