IL4 and infection: Among the Th2-skewing cytokines, there was no significant induction of IL-4, IL-5, and IL-33 in response to RSV infection in both IFNAR KO and WT mice at all timepoints tested (data not shown), while there was a limited increase in TGF-β2 secretion at the earlier timepoints of infection, which was lower in the IFNAR KO mice compared to the WT (Figure 2c).