TGFB1 and infection: After 96 h, 2 and 10 weeks of infection lung leukocytes were obtained from infected AhR−/− and WT mice and analyzed by flow cytometry for the presence of intracellular cytokines (IL-12, TNF-α, IL-1β, IL-6, TGF-β and IL-10) in CD11c+ gated cells.