TABLE 3.

Comparison of the in vitro activities of various antimicrobial agents against all anaerobes from each source category

Antimicrobial agent	Results for anaerobe source categorya
	Intra-abdominal (346)		Ob-gyn (112)		Blood (51)		Other (47)
	MIC90b	%Sc	MIC90	%S	MIC90	%S	MIC90	%S
Piperacillin-tazobactam	4	100	2	100	2	100	4	100
Ampicillin-sulbactam	8	92	8	98	16	88	16	81
Penicillin G	32	16	32	25	32	14	32	34
Cefoxitin	16	94	16	96	16	90	32	89
Imipenem	0.25	100	0.12	100	0.25	98	0.5	100
Meropenem	0.5	99.1	0.25	100	1	96	1	100
Ciprofloxacin	32	23	16	30	32	23	32	38
Trovafloxacin	2	93	2	96	2	94	2	92
Clindamycin	16	74	4	87	16	71	16	79
Metronidazole	2	99.7	2	97	1	98	2	100

^aNumbers in parentheses indicate the number of isolates tested. 

^bMIC₉₀s of antimicrobial agents are expressed in micrograms per milliliter. 

^cPercent susceptible isolates.