IL4 and infection: To investigate lymphocyte activity after infection, we quantitatively determined the presence of IL-2, IFN-γ, TNF-α, IL-4, IL-5, IL-17A, IL-12p70, and IL-22 (Figures 5A–H) in mouse sera at day 3, 5, 7, and 9 post-infection; the sera of healthy mice were used as controls.