M02-A11 Vol. 32 No. 1 Replaces M02-A10 January 2012 Vol. 29 No. 1 Performance Standards for Antimicrobial Disk Susceptibility Tests; Approved Standard—Eleventh Edition This document contains the current Clinical and Laboratory Standards Institute– recommended methods for disk susceptibility testing, criteria for quality control testing, and updated tables for interpretive zone diameters. A standard for global application developed through the Clinical and Laboratory Standards Institute consensus process. Licensed to: Kristin Jonsclottir, Quality Manager Institute of Laboratory MedicineLandspitali Univ. Hospital This document is protected by copyright. CLSI order # Subscription, id # 456617, Downloaded on 1/2/2012. Clinical and Laboratory Standards Institute Advancing Quality in Health Care Testing Clinical and Laboratory Standards Institute (CLSI) is an CLSI’s Administrative Procedures. 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Within the context and operation of CLSI, 610.688.0100 voluntary consensus is substantial agreement by materially F: 610.688.0700 affected, competent, and interested parties that may be www.clsi.org obtained by following the consensus procedures defined in [email protected] Licensed to: Kristin Jonsclottir, Quality Manager Institute of Laboratory MedicineLandspitali Univ. Hospital This document is protected by copyright. CLSI order # Subscription, id # 456617, Downloaded on 1/2/2012. M02-A11 ISBN 1-56238-781-2 (Print) ISBN 1-56238-782-0 (Electronic) ISSN 1558-6502 (Print) Volume 32 Number 1 ISSN 2162-2914 (Electronic) Performance Standards for Antimicrobial Disk Susceptibility Tests; Approved Standard—Eleventh Edition Franklin R. Cockerill, III, MD Janet A. Hindler, MCLS, MT(ASCP) Matthew A. Wikler, MD, MBA, FIDSA Jean B. Patel, PhD, D(ABMM) Jeff Alder, PhD Mair Powell, MD, FRCP, FRCPath Michael N. Dudley, PharmD, FIDSA Jana M. Swenson, MMSc George M. Eliopoulos, MD Richard B. Thomson Jr., PhD Mary Jane Ferraro, PhD, MPH Maria M. Traczewski, BS, MT(ASCP) Dwight J. Hardy, PhD John D. Turnidge, MD David W. Hecht, MD Melvin P. Weinstein, MD Barbara L. Zimmer, PhD Abstract Susceptibility testing is indicated for any organism that contributes to an infectious process warranting antimicrobial chemotherapy, if its susceptibility cannot be reliably predicted from knowledge of the organism’s identity. Susceptibility tests are most often indicated when the causative organism is thought to belong to a species capable of exhibiting resistance to commonly used antimicrobial agents. A variety of laboratory methods can be used to measure the in vitro susceptibility of bacteria to antimicrobial agents. In many clinical microbiology laboratories, an agar disk diffusion method is used routinely for testing common, rapidly growing, and certain fastidious bacterial pathogens. Clinical and Laboratory Standards Institute document M02-A11—Performance Standards for Antimicrobial Disk Susceptibility Tests; Approved Standard—Eleventh Edition includes a series of procedures to standardize the way disk diffusion tests are performed. The performance, applications, and limitations of the current CLSI-recommended methods are also described. The supplemental information (M1001 tables) presented with this standard represents the most current information for drug selection, interpretation, and quality control using the procedures standardized in M02. These tables, as in previous years, have been updated and should replace tables published in earlier years. Changes in the tables since the previous edition (M100-S212) appear in boldface type and are also summarized in the front of the document. Clinical and Laboratory Standards Institute (CLSI). Performance Standards for Antimicrobial Disk Susceptibility Tests; Approved Standard—Eleventh Edition. CLSI document M02-A11 (ISBN 1-56238-781-2 [Print]; ISBN 1-56238-782-0 [Electronic]). Clinical and Laboratory Standards Institute, 950 West Valley Road, Suite 2500, Wayne, Pennsylvania 19087 USA, 2012. The Clinical and Laboratory Standards Institute consensus process, which is the mechanism for moving a document through two or more levels of review by the health care community, is an ongoing process. Users should expect revised editions of any given document. Because rapid changes in technology may affect the procedures, methods, and protocols in a standard or guideline, users should replace outdated editions with the current editions of CLSI documents. Current editions are listed in the CLSI catalog and posted on our website at www.clsi.org. 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To request permission to use this publication in any other manner, contact the Executive Vice President, Clinical and Laboratory Standards Institute, 950 West Valley Road, Suite 2500, Wayne, Pennsylvania 19087, USA. Suggested Citation CLSI. Performance Standards for Antimicrobial Disk Susceptibility Tests; Approved Standard—Eleventh Edition. CLSI document M02-A11. Wayne, PA: Clinical and Laboratory Standards Institute; 2012.