CD30+/+ and CD30−/− mice were infected i.n. with influenza X31 and, the antigen-specific CD8 T-cell response to the immunodominant epitope NP366-74 was assessed using Db/NP366-74 MHC class I tetramers at day 10 (the peak of the primary CD8 T-cell response). Here, CD8A is linked to influenza.