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The standardized disk diffusion test, in which a 10-micrograms enoxacin disk is used, was performed and microbroth dilution MICs were determined to establish individual test control values with Escherichia coli ATCC 25922, Pseudomonas aeruginosa ATCC 27853, Staphylococcus aureus ATCC 25923, and S. aureus ATCC 29213. In addition, regression analysis correlating inhibitory zone diameter with MICs for approximately 400 gram-negative clinical isolates was performed. Based on linear regression and error rate-bounded analyses, criteria for the category calls of isolates are proposed.

Enoxacin (CI-919) was evaluated for activity against 120 multiply resistant clinical isolates of the family Enterobacteriaceae and Pseudomonas aeruginosa. The MIC of enoxacin for 95% of the strains tested was less than or equal to 2 micrograms/ml. Approximately 90% of the isolates were susceptible to enoxacin, norfloxacin, ceftazidime, moxalactam, cefotaxime, cefoperazone, and amikacin. Marked resistance to the other seven antimicrobial agents tested was observed.