Table 1.

Analytical sensitivity and specificity of the Xpert vanA PCR

Organism	No. of strains/replicates tested	No. of Xpert vanA-positive isolates
E. faecium (vancomycin resistant) (101 CFU/ml)	5	2
E. faecium (vancomycin resistant) (102 CFU/ml)a	5	5
E. faecium (vancomycin resistant) (103 CFU/ml)	2	2
E. faecium (vancomycin resistant) (104 CFU/ml)	2	2
E. faecium (vancomycin resistant) (105 CFU/ml)	2	2
E. faecium (vancomycin resistant) (106 CFU/ml)	2	2
E. faecium (vancomycin resistant) (107 CFU/ml)	2	2
E. faecium (vancomycin resistant)	81	81
E. faecalis (vancomycin resistant)	20	18b
E. faecium (vancomycin susceptible)	2	0
E. faecium (vancomycin intermediate)	1	0
E. faecalis (vancomycin susceptible)	2	0
Enterococcus raffinosus	1	0
Enterococcus gallinarum	1	0
S. aureus	2	0
Glycopeptide-intermediate S. aureus	3	0
Lactobacillus johnsonii	1	0
Gram-negative bacillic	14	0

^aThe lower limit of detection was 100 CFU/ml.

^bTwo isolates were E. faecalis vanB positive.

^cIncludes several Enterobacteriaceae isolates.