CD4 and infection: Flow cytometry analysis revealed that CD4+, CD8+, and γδ+ T cell subsets (Supplemental Figure 4) all contributed to both IL-17 (Figure 5, D–F) and IL-22 (Figure 5, G–I) production on day 3 after infection, and the inhibition of IL-10 significantly enhanced the production of these cytokines by all T cell subsets.