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Individual proliferative responses (A) and IFN-γ levels (B) stimulated by ST-CF or PPD in PBL of TB patients and healthy contacts segregated on the basis of disease. Patients with minimal TB, n = 8; patients with severe TB, n = 22; contacts of patients with minimal TB, n = 9; contacts of patients with severe TB, n = 26. Median values (solid bars) are indicated.
