In the liver, rapid ILC1-mediated IFN-γ production is essential for early suppression of cytomegalovirus (CMV) viremia (156); in the lungs, production of amphiregulin by ILC2 is critical for restoration of epithelial integrity and lung function following influenza infection, while excessive remodeling can predispose to allergy (157, 158). The gene discussed is IFNG; the disease is influenza.