Journal of Antimicrobial Chemotherapy (1999) 43, 729-731
© 1999 The British Society for Antimicrobial Chemotherapy
Brief report |
Reduced susceptibility to vancomycin of nosocomial isolates of methicillin-resistant Staphylococcus aureus
a Department of Microbiology, Medical School, University of Athens, 115 27 Athens, Greece; b Department of Hygiene and Epidemiology, Medical School, University of Athens, 115 27 Athens, Greece
The MICs of vancomycin for 56 random nosocomial Staphylococcus aureusisolates homogeneously resistant to methicillin (homMRSA), 16 heterogeneously resistant isolates (hetMRSA) and 25 susceptible isolates (MSSA) were determined by a standard broth microdilution method. Representative isolates were also tested by an agar incorporation method, the Etest and population analysis. Although always in the susceptible range, MICs of vancomycin for homMRSA were significantly higher than those for hetMRSA or MSSA. Moreover, a homMRSA strain belonging to one of the major Greek MRSA clones contained a sub-population of cells that could grow in the presence of vancomycin 8 mg/L at a frequency of 6.7 x10-8.
* Tel: +30-1-777-1165; Fax: +30-1-770-4225; E-mail: avatopou{at}atlas.uoa.gr
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