Reflecting their dramatic decrease in CD4+ counts (mean: 11/mm3), AIDS patients diagnosed with NTM (MOTT) disease were completely unreactive to all antigens tested (PPD: 147 ± 41; Ag85: 105 ± 32; PWM 104 ± 31) (Figures 2(a), 2(b), and 2(c), resp). Here, CD4 is linked to AIDS.