TABLE 3.

Antigen-stimulated release of IFN-γ in whole-blood cultures from tuberculin skin test-negative and -positive individuals

Subject	Skin test measurement (response)a	IFN-γ response (IU/ml)
		Nil antigen	Human PPD	Avian PPD	Bovine PPD	Mitogen
1	0 (−)	0	0	0	0	100
2	0 (−)	0	0	0	0	21.43
3	0 (−)	0	2.61	0	0	79.89
4	0 (−)	0	0.13	1.17	0	37.39
5	0 (−)	0	0.46	0.46	0.33	199
6	0 (−)	0	0	0	0	105
7	0 (−)	0	0	0	0	66.54
8	0 (−)	0	0.87	2.14	0.7	56.68
9	3 (−)	0	0.65	0	0.52	40.00
10	3 (−)	0	2.55	3.73	2.42	78.70
11	15 (+)	0	18.85	10.39	14.86	80.99
12	15 (+)	0	142	68.85	104	50.52
13	25 (+)	0	7.13	3.62	4.32	36.86
14	10 (+)	0	22.78	1.77	21.08	81.51
15	10 (+)	0	16.30	4.58	8.58	89.24
16	15 (+)	0	5.45	3.31	4.32	14.70
17	15 (+)	0	10.19	1.89	2.54	48.03
18	17 (+)	0	20.50	1.66	10.02	15.79
19	15 (+)	0	6.02	3.02	4.55	45.75
20	17 (+)	0	32.95	17.05	28.57	68.74

^aMeasurements are in millimeters.