TABLE 2.

Reference broth microdilution MIC₅₀, MIC₉₀, and percent resistant comparing 130 mucoid and 368 nonmucoid isolates of P. aeruginosa from CF patients

Antimicrobial(s)a	MIC50 (μg/ml)		MIC90 (μg/ml)		% Resistant
	Mucoid	Nonmucoid	Mucoid	Nonmucoid	Mucoid	Nonmucoid
Amikacin	16	32	128	256	28.9	44.6
Gentamicin	8	16	32	>64	35.9	58.2
Tobramycin	2	4	16	32	10.9	26.1
Ticarcillin	64	128	>256	>256	37.5	58.4
Ticarcillin-clavulanate	32	256	>256	>256	39.1	59.0
Piperacillin	16	128	>256	>256	29.7	54.6
Piperacillin-tazobactam	16	128	>256	>256	27.3	51.5
Ceftazidime	8	64	>64	>64	28.1	57.5
Aztreonam	8	64	>64	>64	32.0	59.1
Ciprofloxacin	1	2	4	8	21.9	42.8
Imipenem	2	8	>16	>16	21.9	46.0
Meropenem	1	4	16	>16	11.7	32.2
Allb					27.1	49.2

^aTicarcillin-clavulanate, 2 μg/ml; piperacillin-tazobactam, 4 μg/ml. 

^bMean values.