IL4 and infection: The lung homogenates of WT and AhR−/− mice were collected after 96 h, 2 and 10 weeks of infection and used to evaluate the presence of cytokines (IL-12, TNF-α, IL-1β, IL-6, IL-23, IL-2, IFN-γ, IL-4, IL-17, IL-22, TGF-β, IL-10, IL-27, and IL-35).