Commentary: Impact of CLSI Breakpoint Changes on Microbiology Laboratories and Antimicrobial Stewardship Programs

Author:

Heil Emily L.1,Johnson J. Kristie2

Affiliation:

1. Department of Pharmacy, University of Maryland Medical Center, Baltimore, Maryland, USA

2. Department of Pathology, University of Maryland School of Medicine, Baltimore, Maryland, USA

Abstract

ABSTRACT In 2010, the Clinical and Laboratory Standards Institute (CLSI) lowered the MIC breakpoints for many beta-lactam antibiotics to enhance detection of known resistance among Enterobacteriaceae . The decision to implement these new breakpoints, including the changes announced in both 2010 and 2014, can have a significant impact on both microbiology laboratories and antimicrobial stewardship programs. In this commentary, we discuss the changes and how implementation of these updated CLSI breakpoints requires partnership between antimicrobial stewardship programs and the microbiology laboratory, including data on the impact that the changes had on antibiotic usage at our own institution.

Publisher

American Society for Microbiology

Subject

Microbiology (medical)

Reference21 articles.

1. CLSI. 2010. Performance standards for antimicrobial susceptibility testing: 20th informational supplement, CLSI document M100-S20. Clinical and Laboratory Standards Institute, Wayne, PA.

2. CLSI. 2014. Performance standards for antimicrobial susceptibility testing: 24th informational supplement, CLSI document M100-S24. Clinical and Laboratory Standards Institute, Wayne, PA.

3. The European Committee on Antimicrobial Susceptibility Testing. 2015. Breakpoint tables for interpretation of MICs and zone diameters. Version 5.0 2015. http://www.eucast.org.

4. Extended-Spectrum β-Lactamase Producers Reported as Susceptible to Piperacillin-Tazobactam, Cefepime, and Cefuroxime in the Era of Lowered Breakpoints and No Confirmatory Tests

5. Incidence of Extended-Spectrum- -Lactamase-Producing Escherichia coli and Klebsiella pneumoniae Isolates That Test Susceptible to Cephalosporins and Aztreonam by the Revised CLSI Breakpoints

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