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Correlation of erythromycin agar dilution susceptibility testing with disc diffusion susceptibility for Bordetella
N Cimolai1, A Zaher, C Trombley
1Program of Microbiology, Virology, and Infection Control, British Columbia's Children's Hospital, 4480 Oak Street, Vancouver B.C. V6H 3V4, Canada.
Abstract:
Agar dilution and disc diffusion susceptibility testing of erythromycin were performed for contemporary isolates of Bordetella pertussis with the use of charcoal media. Minimum inhibitory concentration (MIC) values ranged from < or = 0.016-0.5 mg/l and the MIC(50) and MIC(95) were 0.125 and 0.25 mg/l respectively. Disc diffusion zone sizes were interpretable after either 48 or 72 h of incubation and all inhibition diameters were > or = 37 mm.
