CD8A and infection: Influenza A virus (H3N2 strain) infection: 1. Increased expression of IL-22 in early time point of IAV infection 2. iNKT cells showed the highest fold change of IL-22 expression among other IL-22-producing cells including αβ T cells, γδ T cells and ILCs 3. IL22 KO mouse showed decreased survival rate with severe pathology and IAV-specific CD8+ T cells compared to WT mouse