Over the past two decades, vancomycin has been considered theantibiotic of choice for methicillin-resistant Staphylococcusaureus (MRSA) infections. Indeed, multidrug-resistant clonesof MRSA for which the only available effective antibacterialagent is vancomycin have recently been identified. Recent reportsdescribing the therapeutic failure of vancomycin for MRSA infectionshave aroused considerable concern regarding the emergence ofMRSA strains for which there will be no effective therapy.1,2,3The mechanism of reduced susceptibility in these staphylococcalstrains has not been identified, although data indicate thatit is not the same as the vancomycin-resistance mechanism inenterococcal strains.4
Testing for Susceptibility to Antimicrobial Agents
Characterization of Vancomycin-Resistant Isolates
Results
Reduced Susceptibility to Vancomycin and Resistance to Other Antibiotics in MRSA Strain PC-3
Genetic Relatedness of MRSA Isolates PC-1, PC-2, and PC-3
Selection of Highly Vancomycin-Resistant S. aureus in Vitro
Genetic Relatedness to Strain PC-3 of an MRSA Clone Widely Spread in Metropolitan New York City
Susceptibility to Vancomycin
Some Properties of the Vancomycin-Resistant Strain PC-3
Effect of Synergistic Combinations of Vancomycin and -Lactam Antibiotics
Discussion
Source Information
From the Laboratory of Microbiology, Rockefeller University, New York (K.S., R.B.R., A.T.); New York HospitalCornell Medical Center, New York (R.B.R.); and United Hospital Medical Center, Port Chester, N.Y. (S.W.H.).
Address reprint requests to Dr. Tomasz at the Laboratory of Microbiology, Rockefeller University, 1230 York Ave., New York, NY 10021, or at tomasz@rockvax.rockefeller.edu.
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