TABLE 4.

Susceptibility test results for enterococci

Class and drug	No. of isolates	Breakpoint standard	No. in interpretive categorya			Result (%)
			S	I	R	EA	CA	mE	ME	VME
Glycopeptides
Vancomycin	163	NCCLS	131	4	28	98.2	98.8	0.6	0.8	0.0
Teicoplanin	163	NCCLS	145		17	98.8	99.4	0.0	0.7	0.0
MLS
Pristinamycin	163	SFM	68	61	34	90.2	93.9	5.5	1.5	0.0
Quinupristin-dalfopristin	164	NCCLS	50	20	94	93.3	94.5	1.8	12.0	0.0
Erythromycin	146	NCCLS	16	60	70	88.4	89.7	10.3	0.0	0.0
β-Lactam penicillins
Ampicillin	163	NCCLS	129		34	98.2	99.4	0.0	0.8	0.0
Penicillin	163	NCCLS	120		43	96.9	100.0	0.0	0.0	0.0
Aminoglycosides
Gentamicin (synergy)	163	NCCLS	115		48	100.0	98.2	0.0	0.9	4.2
Streptomycin (synergy)	163	NCCLS	105		58	100.0	98.2	0.0	0.0	5.2
5-Fluoroquinolones
Ciprofloxacin	162	NCCLS	67	30	65	92.6	92.6	3.7	0.0	9.2
Levofloxacin	161	NCCLS	105	10	46	96.3	98.1	1.9	0.0	0.0
Trovafloxacin	160	NCCLS	112	14	34	88.8	92.5	6.3	0.0	5.9
Pefloxacin	162	SFM	1	85	76	92.6	92.6	6.8	0.0	1.3
Norfloxacin	161	NCCLS	89	22	50	94.4	96.3	3.7	0.0	0.0
Others
Tetracycline	163	NCCLS	60	5	98	96.3	96.3	1.8	3.3	0.0
Chloramphenicol	162	NCCLS	129	9	24	93.2	96.9	1.2	2.3	0.0
Nitrofurantoin	163	NCCLS	120	39	14	98.7	98.8	1.2	0.0	0.0
Linezolid	146	NCCLS	146			98.0	100.0	0.0	0.0	0.0
Rifampin	163	NCCLS	56	40	67	68.1	76.1	13.5	30.4	0.0

^aAbbreviations: S, susceptible; I, intermediate; R, resistant.