Haemophilus influenzae ATCC 49766, an alternative quality control strain for monitoring broth microdilution susceptibility tests with selected β- lactams

A. L. Barry, J. H. Jorgensen, D. J. Hardy, S. D. Allen, C. N. Baker

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

A β-lactamase-negative, ampicillin-resistant strain of Haemophilus influenzae is currently used for quality control of broth microdilution tests performed with Haemophilus test medium (HTM). Studies with eight lots of HTM broth documented the fact that MIC limits for some antimicrobial agents are unrealistically stringent; i.e., only three of eight lots of HTM broth were satisfactory for testing cefaclor. An alternative, ampicillin-susceptible strain of H. influenzae (ATCC 49766) was found to provide much more reproducible results with five problematic drugs (cefaclor, cefuroxime, cefamandole, loracarbef, and cefonicid). Multilaboratory studies defined MIC control limits for both control strains tested against 12 antimicrobial agents.

Original languageEnglish (US)
Pages (from-to)2033-2037
Number of pages5
JournalJournal of clinical microbiology
Volume30
Issue number8
DOIs
StatePublished - 1992
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology (medical)

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