IL4 and infection: Consistent with the leukocyte responses, we observed no significant increases in IL-4 or IL-13 gene expression in the livers (Fig. 4) or intestines (not shown) of IL-4Rαflox/ΔLysMCre mice when compared with expression in IL-4Rαflox/Δ littermate controls 9 and 16 weeks post-infection.