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JAC Advance Access originally published online on November 1, 2002
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Journal of Antimicrobial Chemotherapy (2002) 50, 933-938
© 2002 The British Society for Antimicrobial Chemotherapy

In vitro activity of quinupristin/dalfopristin, linezolid, telithromycin and comparator antimicrobial agents against 13 species of coagulase-negative staphylococci

M. A. John1,2, C. Pletch1 and Z. Hussain1,2,*

1 Department of Microbiology & Infection Control, London Health Sciences Centre; 2 University of Western Ontario, London, Ontario, Canada

Received 18 January 2002; returned 17 July 2002; revised 28 August 2002; accepted 10 September 2002

Objectives: To determine in vitro susceptibilities of a large series of speciated coagulase-negative staphylococci (CNS) against three new antibiotics, linezolid, quinupristin/dalfopristin and telithromycin.

Methods: Susceptibilities to three new antibiotics and oxacillin, vancomycin, clindamycin and erythromycin were determined by the agar dilution method, as described by the NCCLS.

Results: Resistance to linezolid was not observed in any isolates, although MIC90 values varied between species. Fifteen of 658 (2.3%) isolates were resistant to quinupristin/dalfopristin, but <1% of the clinically most important isolates of Staphylococcus epidermidis, Staphylococcus haemolyticus and Staphylococcus hominis demonstrated resistance to this agent. Susceptibility to clindamycin correlated with susceptibility to quinupristin/dalfopristin; however, resistance to clindamycin did not predict quinupristin/dalfopristin resistance. Telithromycin was the least active of the new agents tested, showing activity similar to that of clindamycin. Susceptibility and resistance to clindamycin were predictive of susceptibility and resistance to telithromycin.

Conclusion: Clindamycin susceptibility can be used as a surrogate marker for susceptibility to quinupristin/dalfopristin and telithromycin. Quinupristin/dalfopristin and linezolid show good activity against both mecA-positive and -negative CNS.

* Corresponding author. Tel: +1-519-685-8149; Fax: +1-519-685-8203; E-mail: Zafar.hussain{at}lhsc.on.ca


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