
M100, 29th ed.
January 2019
Replaces M100, 28th ed.
Performance Standards for Antimicrobial Susceptibility Testing
Melvin P. Weinstein, MD
Jean B. Patel, PhD, D(ABMM)
April M. Bobenchik, PhD, D(ABMM)
Shelley Campeau, PhD, D(ABMM)
Sharon K. Cullen, BS, RAC
Marcelo F. Galas
Howard Gold, MD, FIDSA
Romney M. Humphries, PhD, D(ABMM)
Thomas J. Kirn, Jr., MD, PhD
James S. Lewis II, PharmD, FIDSA
Brandi Limbago, PhD
Amy J. Mathers, MD, D(ABMM)
Tony Mazzulli, MD, FACP, FRCP(C)
Sandra S. Richter, MD, D(ABMM), FCAP, FIDSA
Michael Satlin, MD, MS
Audrey N. Schuetz, MD, MPH, D(ABMM)
Jana M. Swenson, MMSc
Pranita D. Tamma, MD, MHS
Abstract
The data in the tables are valid only if the methodologies in CLSI documents M02,1 M07,2 and M113 are followed. These
standards contain information about disk diffusion (M021) and dilution (M072 and M113) test procedures for aerobic and
anaerobic bacteria. Clinicians depend heavily on information from the microbiology laboratory for treating their seriously ill
patients. The clinical importance of antimicrobial susceptibility test results demands that these tests be performed under optimal
conditions and that laboratories have the capability to provide results for the newest antimicrobial agents. The tables presented in
M100 represent the most current information for drug selection, interpretation, and quality control using the procedures
standardized in M02,1 M07,2 and M11.3 Users should replace previously published tables with these new tables. Changes in the
tables since the previous edition appear in boldface type.
Clinical and Laboratory Standards Institute (CLSI). Performance Standards for Antimicrobial Susceptibility Testing. 29th ed.
CLSI supplement M100 (ISBN 978-1-68440-032-4 [Print]; ISBN 978-1-68440-033-1 [Electronic]). Clinical and Laboratory
Standards Institute, 950 West Valley Road, Suite 2500, Wayne, Pennsylvania 19087 USA, 2019.
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guideline, users should replace outdated editions with the current editions of CLSI documents.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. If you or your organization is not a member and would like to
become one, or to request a copy of the catalog, contact us at: Telephone: +1.610.688.0100; Fax: +1.610.688.0700; E-Mail:
customerservice@clsi.org; Website: www.clsi.org.
M100, 30th ed.
January 2020
Replaces M100, 29th ed.
Performance Standards for Antimicrobial Susceptibility Testing
Melvin P. Weinstein, MD
James S. Lewis II, PharmD, FIDSA
April M. Bobenchik, PhD, D(ABMM)
Shelley Campeau, PhD, D(ABMM)
Sharon K. Cullen, BS, RAC
Marcelo F. Galas
Howard Gold, MD, FIDSA
Romney M. Humphries, PhD, D(ABMM)
Thomas J. Kirn, Jr., MD, PhD
Brandi Limbago, PhD
Amy J. Mathers, MD, D(ABMM)
Tony Mazzulli, MD, FACP, FRCP(C)
Michael Satlin, MD, MS
Audrey N. Schuetz, MD, MPH, D(ABMM)
Patricia J. Simner, PhD, D(ABMM)
Pranita D. Tamma, MD, MHS
Abstract
The data in the tables are valid only if the methodologies in CLSI documents M02,1 M07,2 and M113 are followed. These
standards contain information about disk diffusion (M021) and dilution (M072 and M113) test procedures for aerobic and
anaerobic bacteria. Clinicians depend heavily on information from the microbiology laboratory for treating their seriously ill
patients. The clinical importance of antimicrobial susceptibility test results demands that these tests be performed under optimal
conditions and that laboratories have the capability to provide results for the newest antimicrobial agents. The tables presented in
M100 represent the most current information for drug selection, interpretation, and quality control using the procedures
standardized in M02,1 M07,2 and M11.3 Users should replace previously published tables with these new tables. Changes in the
tables since the previous edition appear in boldface type.
Clinical and Laboratory Standards Institute (CLSI). Performance Standards for Antimicrobial Susceptibility Testing. 30th ed.
CLSI supplement M100 (ISBN 978-1-68440-066-9 [Print]; ISBN 978-1-68440-067-6 [Electronic]). Clinical and Laboratory
Standards Institute, 950 West Valley Road, Suite 2500, Wayne, Pennsylvania 19087 USA, 2020.
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. If you or your organization is not a member and would like to
become one, or to request a copy of the catalog, contact us at: Telephone: +1.610.688.0100; Fax: +1.610.688.0700; E-Mail:
customerservice@clsi.org; Website: www.clsi.org.
CLSI eCLIPSE - Dewanand Mahto - BD - 01/29/2020. Unauthorized duplication or network sharing is not allowed.