CD8A and COVID-19: In COVID-19 recovered PBMCs, the percentage of IL2 and IFN-g secreting CD8+ T cells was enhanced by 76 % and 51 % activated with epitope mix; 80 % and 47 % higher if activated with small protein compared to the negative control [Suppl Fig 3 B (f&g) & C (f&g); Fig. 5C and D; Table 2 B].