TABLE 1.

Susceptibility of 296 invasive GBS isolates to different antibiotics

Antibiotic	MIC (μg/ml)			Breakpointsa (μg/ml)	% (no./total) Resistant
	Range	50% of isolates	90% of isolates
Penicillin G	0.016-0.125	0.047	0.064	<0.12	0
Ampicillin	0.016-0.125	0.094	0.094	<0.25	0
Cefotaxime	0.023-0.19	0.047	0.064	<0.5	0
Erythromycin	0.023->256	0.094	0.94	0.25	10.1 (30/296)
Clindamycin	0.038->256	0.19	0.25	<0.25	5.7 (17/296)
Gentamicin	32-256	128	128	<1.0	100
Linezolid	0.25-1.5	1.0	1.5	>4c	0
Q-Db	0.19-1.5	0.50	0.75	<1.0	0
Imipenem	0.004-0.19	0.032	0.064	<0.5	0
Meropenem	0.012-0.094	0.032	0.047	<0.5	0
Ertapenem	0.023-0.094	0.047	0.064	<1.0	0
Vancomycin	0.38-1.0	1.0	1.0	<1.0	0

^aIf not indicated otherwise, NCCLS (19) breakpoints were used. For linezolid and gentamicin, European Committee on Antimicrobial Susceptibility Testing (10) and Deutsche Industrie Norm (9) breakpoints were used, respectively.

^bQ-D, quinupristin-dalfopristin.

^cResistant.