TABLE 1.

Performances of Granada, Brilliance GBS, and ChromID STRB chromogenic media with 200 nonconsecutive vaginal swabs (including 35 positive ones by at least two culture methods) taken from women 35 to 37 weeks pregnant^e

Medium	No. of samples				Se (%)	Sp (%)	PPV (%)	NPV (%)
	Target colora		Nontarget color
	GBS	Other sp.	GBS	Other sp.
Granada	33	0	2b	165	94.3	100	100	98.8
Brilliance GBS	35	16c	0	149	100	90.3	68.6	100
ChromID STRB	35	2d	0	163	100	98.8	94.6	100

^aTarget-colored colonies were orange on Granada medium, pink on Brilliance GBS medium, and pink to red on ChromID STRB medium.

^bGrowth of white colonies.

^cSix strains of Streptococcus pneumoniae, six strains of Streptococcus mitis/oralis, four strains of Streptococcus salivarius, and one strain of Streptococcus parasanguinis. One sample yielded pink colonies for both S. pneumoniae and S. salivarius.

^dOne strain of S. pneumoniae and one strain of Enterococcus faecium.

^eSe, sensitivity; Sp, specificity; PPV, positive predictive value; NPV, negative predictive value; GBS, group B Streptococcus; sp, species.