Table 1. Percentage of subjects who developed HIV-associated TB during longitudinal follow up according to antigen specificity of baseline IFN-γ responses.

Number of baseline IFN-γ responses	Antigen	n	Percent who developed TB
Zero	None	270	14%
One	ESAT-6	4	25%
	Ag85	6	0%
	WCL	208	8%
Two	ESAT-6 + Ag85	1	0%
	WCL + ESAT-6	66	5%
	WCL + Ag85	37	11%
Three	WCL + Ag85 + ESAT-6	114	4%
	Total	706	9%

Ag85, antigen 85; ESAT-6, early secreted antigenic target 6; IFN-γ, interferon gamma; TB, tuberculosis; WCL, whole cell lysate.