Upon infection, activated epithelial cells secrete a suite of alarmins, including interleukin (IL)-25, thymic stromal lymphopoietin (TSLP), and IL-33, which promote activation and differentiation of innate and adaptive immune cells, leading to type 2 inflammation (Anthony et al., 2006, Katona et al., 1991, McCoy et al., 2008, Urban et al., 1991a). Here, TSLP is linked to infection.