Following intranasal influenza infection, NKG2A−/− mice display decreased frequency of CD8+ T cells (Fig. 4 Bottom middle) but show similar frequencies of CD4+ (Fig. 4 Bottom Left) and NP366 -specific CD8+ T cells (Figure 4 Bottom Right) the BAL when compared to C57BL/6 (WT) mice. The gene discussed is CD8A; the disease is influenza.