Figure 1.

Kinetics of IFN-γ released after stimulation of whole blood with tuberculins in the vaccinated group. Avian tuberculin (PPD-A, ▲), bovine tuberculin (PPD-B, ■). Results are expressed as mean ΔOD₄₅₀ (mean of OD₄₅₀ of antigen-stimulated values with unstimulated values subtracted) ± 95% confidence interval.