Parasitic infections induce a type-2 response that is initiated by innate lymphoid cells 2 (ILC2)-producing interleukin (IL)-5, IL-9, and IL-13 (14, 15), which induces CD4+ T helper 2 (Th2) cells that secrete IL-4, IL-5, and IL-13 (15). Here, IL4 is linked to infection.