Fig. 2. : proportion of tuberculin skin test (TST)-positive (TST+) and TST-negative (TST-) donors that recognised selected Mycobacterium tuberculosis (MTB) peptides. Peripheral blood mononuclear cells (PBMCs) from 16 TST-positive and 16 TST-negative healthy donors were tested with seven MTB derived peptides and the spot forming cells interferon-γ/106 PBMC were calculated. The columns represent the proportion of TST-positive and TST-negative individuals that recognised at list one peptide (p = 0.001, Mann-Whitney U test).