The animals were sacrificed 96 hours and 2 weeks after infection, their lungs removed, macerated and the leukocytes analyzed by flow cytometry for the intracellular expression of IDO, AhR, and cytokines (IL-12, TNF-α, IL-1β, IL-6, TGB-β, and IL-10) by CD11c+ myeloid cells. Here, IDO1 is linked to infection.