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Antimicrobial Agents and Chemotherapy, November 2008, p. 4175-4177, Vol. 52, No. 11
0066-4804/08/$08.00+0 doi:10.1128/AAC.00420-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.
Rationale for Reading Fluconazole MICs at 24 Hours Rather than 48 Hours When Testing Candida spp. by the CLSI M27-A2 Standard Method
Luis Ostrosky-Zeichner,1*
John H. Rex,1,2
Michael A. Pfaller,3
Daniel J. Diekema,3
Barbara D. Alexander,4
David Andes,5
Steven D. Brown,6
Vishnu Chaturvedi,7
Mahmoud A. Ghannoum,8
Cindy C. Knapp,9
Daniel J. Sheehan,10 and
Thomas J. Walsh11
University of Texas Medical School at Houston, Houston, Texas,1
AstraZeneca, Macclesfield, Cheshire, United Kingdom,2
University of Iowa, Iowa City, Iowa,3
Duke University, Durham, North Carolina,4
University of Wisconsin, Madison, Wisconsin,5
The Clinical Microbiology Institute, Wilsonville, Oregon,6
New York State Department of Health, Albany, New York,7
Case Western Reserve University, Cleveland, Ohio,8
TREK Diagnostic Systems, Cleveland, Ohio,9
Pfizer Inc., New York, New York,10
National Cancer Institute, Bethesda, Maryland,11
Received 28 March 2008/
Returned for modification 2 July 2008/
Accepted 9 September 2008
We investigated if CLSI M27-A2 Candida species breakpoints for fluconazole MIC are valid when read at 24 h. Analysis of a data set showed good correlation between 48- and 24-h MICs, as well as similar outcomes and pharmacodynamic efficacy parameters, except for isolates in the susceptible dose-dependent category, such as Candida glabrata.
* Corresponding author. Mailing address: University of Texas Medical School at Houston, 6431 Fannin, MSB 2.112, Houston, TX 77030. Phone: (713) 500-6733. Fax: (713) 500-5495. E-mail:
Luis.Ostrosky-Zeichner{at}uth.tmc.edu
Published ahead of print on 22 September 2008.
Antimicrobial Agents and Chemotherapy, November 2008, p. 4175-4177, Vol. 52, No. 11
0066-4804/08/$08.00+0 doi:10.1128/AAC.00420-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.
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