CD8A and influenza: The Babraham inbred pigs allowed us to enumerate influenza NP-specific CD8+ T cell responses in NT, lung, BAL, TBLN, and PBMC using two NP epitope tetramers: NP181-189 AAVGKVGTI (AAV) and NP290-298 DFEREGYSL (DFE) as previously described (22) (Figure 3A).