Failure of Quality Control Measures To Prevent Reporting of False Resistance to Imipenem, Resulting in a Pseudo-Outbreak of Imipenem-Resistant Pseudomonas aeruginosa

Author:

Carmeli Yehuda1,Eichelberger Karen2,Soja Don3,Dakos Joanna2,Venkataraman Lata2,DeGirolami Paola2,Samore Matthew1

Affiliation:

1. Division of Infectious Diseases1 and

2. Department of Pathology,2 Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, and

3. Health Sciences Services, Merck & Co. Inc., West Point, Pennsylvania3

Abstract

ABSTRACT False results showing an outbreak of Pseudomonas aeruginosa with resistance to imipenem were traced to a defective lot of microdilution MIC testing panels. These panels contained two- to threefold lower concentrations of imipenem than expected and resulted in artifactual two- to fourfold increases in MICs of imipenem. The quality-control MIC results for Pseudomonas aeruginosa ATCC 27853 were 4 μg/ml, the highest value within the range recommended by the National Committee for Clinical Laboratory Standards. We recommend that this value be considered out of the quality-control range.

Publisher

American Society for Microbiology

Subject

Microbiology (medical)

Reference9 articles.

1. Molecular epidemiology of acquisition of ceftazidime-resistant gram-negative bacilli in a nonoutbreak setting

2. Imipenem stability in a predried susceptibility panel

3. National Committee for Clinical Laboratory Standards Performance standards for antimicrobial disk susceptibility tests 6th ed. Approved standard M2-A6. 1997 National Committee for Clinical Laboratory Standards Wayne Pa

4. National Committee for Clinical Laboratory Standards Methods for dilution antimicrobial susceptibility tests for bacteria that grow aerobically 6th ed. Approved standard M7-A4. 1997 National Committee for Clinical Laboratory Standards Wayne Pa

5. False resistance to imipenem with a microdilution susceptibility testing system;O’Rouke E. J.;J. Clin. Microbiol.,1991

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