Table 3.

MICs of antimicrobials against isolates of P. aeruginosa, including 39016^a

Antimicrobial	MIC for isolate 39016	Value for all isolates, including 39016				P. aeruginosa systemic breakpoint
		MIC50	MIC90	Min	Max
Penicillin	256	512	512	256	512	NA
Cefuroxime	256	300	512	256	512	NA
Ceftazidime	1.5	1	1.50	0.25	3	8
Chloramphenicol	24	512	512	0.09	512	NA
Gentamicin	1.5	1.50	2	0.19	12	4
Amikacin	2	2	3	1	512	8
Vancomycin	256	512	512	256	512	NA
Teicoplanin	256	512	512	256	512	NA
Ciprofloxacin	0.94	0.09	0.25	0.03	1	0.5
Ofloxacin	0.75	0.50	1.50	0.03	6	2

^aAll values are in mg/liter. The table shows the minimum (Min) and maximum (Max) MICs and the MIC at which 50% (MIC₅₀) and 90% (MIC₉₀) of isolates were inhibited for a collection of keratitis isolates reported previously (24, 51). The systemic breakpoint concentrations for which P. aeruginosa is regarded as susceptible or resistant to that antimicrobial according to the British Society of Antimicrobial Chemotherapy (1) are included. NA, not applicable.