TNFRSF9 and infection: −70% recovered patients activated cells - Produce IFNγ, TNFα, IL2, GzB - Express CD69, CD137 - Recruited later during infection at convalescence - HLA-B*07:02/N105−113 is a dominant SARS-CoV-2-specific epitope following infection (38 × larger than B7/N257, A2/S269 and A24/S1208)