Table 1.

BC-GP assay and conventional identification of bacterial isolates in 148 blood cultures

BC-GP assay target	No. of isolates detected by:		% agreement
	BC-GP assaya	Conventional identificationb
Staphylococcus spp.c	78	81	96
S. aureus	36	38	95
S. epidermidis	25	26	96
Enterococcus faecalis	2	3	67
Enterococcus faecium	15	16	94
Streptococcus spp.d	29	30	97
S. agalactiae	9	9	100
S. anginosus group	1	1	100
S. pneumoniae	6	6	100
Nontarget organismse	26	26	100
Overall target agreementf			96

^aIncludes isolates that were positive on repeat testing after failures in initial testing.

^bSamples with more than one organism corresponding to the same target were counted once per target. Reasons for discrepancies in the numbers between the BC-GP assay results and conventional identification included polymicrobial samples, one repeat test failure, and one failure of the BC-GP assay to detect the target.

^cBC-GP assay target includes S. aureus and S. epidermidis.

^dBC-GP assay target includes S. agalactiae, S. pneumoniae, S. pyogenes, and S. anginosus group.

^eBlood sample organisms that were not intended targets of the BC-GP assay included Aerococcus viridans (n = 2), Bacillus spp. (n = 6), Corynebacterium spp. (n = 8), Escherichia coli (n = 2), Lactobacillus spp. (n = 2), Micrococcus spp. (n = 2), Neisseria spp. (n = 1), Propionibacterium spp. (n = 1), Rothia spp. (n = 1), and C. tropicalis (n = 1).

^fOverall target agreement is the percentage of targets which correlated with organism identification. Resistance markers were not included in this calculation.