Journal
DIAGNOSTIC MICROBIOLOGY AND INFECTIOUS DISEASE
Volume 59, Issue 2, Pages 199-209Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.diagmicrobio.2007.06.001
Keywords
ZAAPS; linezolid; oxazolidinone; resistance; MRSA
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The Zyvox (R) Annual Appraisal of Potency and Spectrum Program has completed its fifth year of monitoring for emerging resistance to linezolid and other Gram-positive active agents on the continents of Europe, Asia, Australia, and Latin America. In 2006, 4216 Gram-positive isolates from 16 nations were submitted for analysis from 6 organism groups including Staphylococcus aureus (54.0%), coagulase-negative staphylococci (CoNS) (14.6%), enterococci (10.0%), Streptococcus pneumoniae (9.4%), viridans group streptococci (5.0%), and beta-hemolytic streptococci (7.0%). Linezolid retained potent activity against S. aureus MIC50 and MIC90, 2 mu g/mL; 39.8% methicillin resistant) and CoNS (MIC50 and MIC90, I mu g/mL; 74.3% methicillin resistant). Despite endemicity of vancomycin-resistant enterococci (up to 30.0%) in several nations, linezolid inhibited >99% of strains at <= 2 mu g/mL (modal MIC, 1 mu g/mL). Among streptococci, all linezolid MIC values were <= 2 mu g/mL. Rare instances of linezolid-resistance were detected in enterococci (2 isolates, China and Germany) and CoNS (3 isolates, Italy and Brazil); 2 CoNS and 1 Enterococcusfiaecium had documented G2576T mutations. Overall, linezolid remained active against 99.88% of tested strains from this global collection. (C) 2007 Elsevier Inc. All rights reserved.
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