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This report describes linezolid susceptibility testing results for 6,741 Gram-positive pathogens from 60 U.S. sites collected during 2015 for the LEADER Program. In addition, the report summarizes linezolidin vitro activity, resistance mechanisms, and molecular typing obtained for 2011 to 2015. During 2015, linezolid showed potent activity in testing againstStaphylococcus aureus , inhibiting &gt;99.9% of 3,031 isolates at ≤2 µg/ml. Similarly, linezolid showed coverage against 99.2% of coagulase-negative staphylococci, 99.7% of enterococci, and 100.0% ofStreptococcus pneumoniae , virdans group, and beta-hemolytic streptococcus isolates tested. The overall linezolid resistance rate remained a modest &lt;1% from 2011 to 2015. Staphylococci, especiallyStaphylococcus epidermidis , showed a range of linezolid resistance mechanisms. Increased annual trends for the presence ofcfr amongStaphylococcus aureus isolates were not observed, but 64.3% (9/14) of the isolates with decreased susceptibility (MIC, ≥4 µg/ml) to linezolid carried this transferrable gene (2011 to 2015). Thecfr gene was detected in 21.9% (7/32) of linezolid-resistant staphylococci other thanS. aureus from 2011 to 2015. TheoptrA gene was noted in half (2/4) of the population of linezolid-nonsusceptibleEnterococcus faecalis isolates from 2011 to 2015, while linezolid-nonsusceptibleEnterococcus faecium isolates showed alterations predominantly (16/16) in the 23S rRNA gene (G2576T). This report confirms a long record of linezolid activity against Gram-positive isolates in the United States since regulatory approval in 2000 and reports the oxazolidinones evolving resistance mechanisms.

antimicrobial agents and chemotherapy

Five-Year Summary of <i>In Vitro</i> Activity and Resistance Mechanisms of Linezolid against Clinically Important Gram-Positive Cocci in the United States from the LEADER Surveillance Program (2011 to 2015)

Five-Year Summary of In Vitro Activity and Resistance Mechanisms of Linezolid against Clinically Important Gram-Positive Cocci in the United States from the LEADER Surveillance Program (2011 to 2015)