Percentage of BAL CD4+ T cells that express intracellular IFN-γ, TNF-α, and IL-2 after stimulation with BeSO4. The mean percentage of Th1 cytokines produced by BAL cells from CBD patients is shown as a solid line: mean ± SEM for IFN-γ, 15.3% ± 2.7% (n = 12); TNF-α, 17.9% ± 3.6% (n = 9); and IL-2, 8.8% ± 1.9% (n = 10). Patients being treated with corticosteroids are underlined.