CD8A and COVID-19: Specifically, of the 15 predicted HLA-A*02:01-restricted peptides of S protein, 13 peptides could bind to HLA-A*02:01, while tetramers from seven peptides (n-Sp1, n-Sp2, n-Sp6, n-Sp7, n-Sp11, n-Sp13, and n-Sp14) could detect antigen-specific CD8+ T-cells in COVID-19 convalescent patients and activate CD8+ T-cell immunity.