Table 2.

MIC90 and MIC50 Values for Meropenem, Ceftazidime, and Cefepime Among CRPA and CSPS Isolates

Antimicrobial Agent				CRPA	CSPA
Meropenem	Resistance Breakpoint (µg/mL)		≥8
	Resistant N(%)			38(100)	0
	Range (µg/mL)	MIC50		8 to >32	–
		MIC90		8 to >32	–
Cefepime	Resistance Breakpoint (µg/mL)		≥32
	Resistant N(%)			33 (86.8)	5 (16.6)
	Range (µg/mL)	MIC50		16 to >1024	2–32
		MIC90		16 to >1024	2–32
Ceftazidime	Resistance Breakpoint (µg/mL)		≥32
	Resistant N(%)			36 (92.1)	11 (36.6)
	Range (µg/mL)	MIC50		32 to >1024	2–32
		MIC90		64 to >1024	2–32

Abbreviations: CRPA, carbapenem-resistant P. aeruginosa; CSPA, carbapenem-susceptible P. aeruginosa.