IL13 and infection: T. muris, depending on the infectious dose, can generate either chronic persistent infections, characterized by a Th1 response and the production of the cytokine interferon (IFN)-γ (low dose infection with ∼25 eggs), or acute infections cleared by a strong Th2 response with the production of interleukin (IL)-5, IL-9, and IL-13 in response to high amounts of eggs (∼150 eggs).