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Comparison of agar dilution, broth dilution, and disk diffusion testing of ampicillin against Haemophilus species by
P C Kohner1, J E Rosenblatt, F R Cockerill
1Department of Laboratory Medicine, Mayo Clinic and Foundation Rochester, Minnesota 55905.
Journal of Clinical Microbiology
|June 1, 1994
Abstract:
An evaluation to determine the optimal method for the in vitro susceptibility testing of Haemophilus strains to ampicillin was undertaken. In our hands, in-house-prepared Haemophilus Test Medium used by either the broth macrodilution or agar dilution method produced the most consistent results, especially for beta-lactamase-negative, ampicillin-resistant H. influenzae strains.