TABLE 2.

Comparison of immunoassays and real-time PCR

Assay	Result (%) for assay
	Sensitivity	Specificity	PPV	NPV
Shiga Toxin Chek
Stool	70.0	99.4	73.7	99.2
Broth	80.0	98.2	53.3	99.5
Shiga Toxin Quik Chek
Stool	70.0	99.9	93.3	99.2
Broth	85.0	100.0	100.0	99.6
Real-time PCR (broth)	95.0	100.0	100.0	99.9