In agreement with previous reports11,16,22,48, we found that both convalescent and uninfected donors had less than 1% of CD8+ T cells positive for each tetramer; however, compared to their uninfected counterparts, COVID-19 convalescent patients had significantly higher frequencies of CD8+ T cells specific for the epitope LLL and for the sum of all six epitopes (Fig. 1e). This evidence concerns the gene CD8A and COVID-19.