TABLE 3.

Sensitivity and specificity of PPD and the combination of ESAT-6 and CFP-10 in TB patients and healthy controls^a

Cutoff value for IFN-γ release pg/ml	Antigen	No. of responders/ total no.		Sensitivity (%)a	Specificity (%)b
		TB patients	Healthy controlsc
>300	PPD	10/11	14/14	91	0
	ESAT-6/CFP10	8/11	4/14	73	71
>1,000	PPD	9/11	13/14	82	7
	ESAT-6/CFP10	8/11	1/14	73	93

^aPercentage of positive responders in the TB-infected group. 

^bPercentage of nonresponders to the antigen in the noninfected group. 

^cBCG-vaccinated and nonvaccinated individuals.