TABLE 2.

Error rates of seven methods for detection of vancomycin resistance in enterococci

Method	Error rate (%)a
	Very major				Major (n = 50)	Minor
	vanA (n = 50)	vanB (n = 15)	vanC1 (n = 50)	vanC2 (n = 30)		vanA (n = 50)	vanB (n = 15)	vanC1 (n = 50)	vanC2 (n = 30)
E-test	0	0	0	0	0	0	13	2	0
Disk diffusion	0	0	0	0	2	0	27	50	37
Agar screen	0	0	0	0	4
MicroScan
Conventional	0	0	0	3	0	0	0	24	90
Rapid	0	33	0	0	0	0	27	14	10
Vitek
GPS-TA	0	40	0	0	4	0	13	28	37
GPS-101	0	0	0	0	4	2	7	12	30

^aRelative to the NCCLS reference agar dilution assay. Error types are defined in the text.