Figure 1

IFN-γ levels (pg/ml) elicited by classical TB antigens in 23 TB patients (TB) and 20 household contacts (HHC). Responses in TB cases are indicated by open symbols and those in household contacts by closed symbols. Error bars represent the median. Ag85A/B = Ag85A and Ag85B tested together, HSP = heat shock protein, PHA = Phytohaemagglutinin.