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An approach to quantitative antibiotic sensitivity testing for some gram-negative pathogens.

The twofold dilution method for quantitative antibiotic sensitivity testing in agar is applicable where each antibiotic concentration in the series is the minimal inhibiting one for a significant proportion of cultures to be tested. The method is of much less relevance where cultures show a biphasic distribution consisting of very sensitive and highly resistant components, or where the margin between the minimal inhibiting concentration (m.i.c.) and attainable blood concentration is small, so that response to a single critical concentration becomes of prime importance.Experiments indicated (a) that kanamycin sensitivity of most Enterobacteria could be measured adequately by their qualitative responses to a single drug concentration (8 μg/ml); (b) that sensitivity of Pseudomonas aeruginosa to gentamicin could be measured in terms of log reduction in viable population by a concentration of 4 μg/ml; and (c) that the classical twofold dilution method was suitable for measuring the sensitivity of P. aeruginosa...