TABLE 4.

Sensitivities of CNA-P and SBA for detection of S. pyogenes

Test medium	No. of specimens			Sensitivity (%)a
	True positive	False negative	True negative
CNA-P	300b	14	1,038	96
SBA	264b	50	1,038	84
Both	314

^aPercentages were based on a total of 314 specimens positive for S. pyogenes as determined by isolation on either medium. 

^bP < 0.001.