However, in IL-4 absence, IFN-γ expression was significantly reduced, either basal (NI WT vs. NI IL-4−/−, p = 0.009, t = 3.315) or after infection with Colombian strain (Inf WT vs. Inf IL-4−/−, p = 0.001, t = 4.43). Here, IFNG is linked to infection.