TABLE 2.

Percent recovery of various gram-negative pathogens for each system at each antimicrobial level

Drug(s)	Concna	% Recovery of organism with indicated system
		E. coli ATCC 25922		K. pneumoniae ATCC 49619		P. aeruginosa ATCC 27853
		BACTEC PLUS	BacT/Alert FA	BACTEC PLUS	BacT/Alert FA	BACTEC PLUS	BacT/Alert FA
Gentamicin	T	100	100	100	100	100	100
	M	100	100	100	100	100	100
	P	100	100	100	100	100	100
Cefepime	T	100	50	100	50	100	100
	M	66	0	100	0	100	33
	P	0	0	100	0	100	0
Cefoxitin	T	100	100	100	17	NTb	NT
	M	100	0	100	0	NT	NT
	P	100	0	100	0	NT	NT
Piperacillin/tazobactam	T	100	83	100	50	100	33
	M	100	33	100	0	100	0
	P	100	0	100	0	100	0

^aT, trough level; M, mid level; P, peak level.

^bNT, not tested.