NDLI: Escherichia coli ATCC 35218 as a Quality Control Isolate for Susceptibility Testing of Haemophilus influenzae with Haemophilus Test Medium

Content Provider	PubMed Central
Author	Butler, D. L. Jakielaszek, C. J. Miller, L. A. Poupard, J. A.
Copyright Year	1999
Abstract	Current National Committee for Clinical Laboratory Standards (NCCLS) susceptibility guidelines for quality control testing with Haemophilus influenzae do not include a β-lactamase-producing strain that could detect the deterioration of the β-lactamase inhibitor components of amoxicillin-clavulanic acid, ampicillin-sulbactam, and piperacillin-tazobactam. The objective of the study was to determine if comparable quality control results for Escherichia coli ATCC 35218, a β-lactamase-producing strain, would be produced for the three β-lactam–β-lactamase inhibitor agents with Haemophilus test medium and Mueller-Hinton medium. The criteria used in this study to determine if Haemophilus test medium was acceptable for quality control testing of E. coli ATCC 35218 was that 100% of the results obtained with an antimicrobial agent-methodology combination needed to be within the acceptable NCCLS ranges established with Mueller-Hinton medium. The MIC testing results obtained by the broth microdilution and E-test methods with amoxicillin-clavulanic acid and piperacillin-tazobactam were all within the NCCLS ranges; however, the results obtained with ampicillin-sulbactam by both methods were not within the NCCLS ranges. Acceptable results were obtained by the disk diffusion methodology with ampicillin-sulbactam and piperacillin-tazobactam but not with amoxicillin-clavulanic acid. When performing susceptibility testing with H. influenzae with the β-lactam–β-lactamase inhibitors, in addition to quality control testing with H. influenzae ATCC 49247, testing of E. coli ATCC 35218 on Haemophilus test medium is an effective way to monitor the β-lactamase inhibitors in some antimicrobial agent-methodology combinations.
Starting Page	283
File Format	PDF
ISSN	10986596
e-ISSN	10986596
Journal	Antimicrobial Agents and Chemotherapy
Issue Number	2
Volume Number	43
Language	English
Publisher	American Society for Microbiology
Publisher Date	1999-02-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Pharmacology Pharmacology (medical)

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