KIT and infection: While both c-kit+ and c-kit− ILC2 accumulate in the lungs following IAV infection, the c-kit− ILC2 subset predominates during the acute phase of infection (2–7 d.p.i.)with the c-kit+ ILC2 rapidly accumulating in increasingly large numbers during the recovery phase i.e. after infectious virus clearance at 8–9 d.p.i. and beyond (Figure 2B).