CD8A and COVID-19: As shown in Figure 3B, the isolated PBMCs from all donors and regardless of the COVID‐19 vaccination contained no detectable TNF‐α‐, IFNγ‐, or TNF‐α/IFNγ‐producing CD4+ or CD8+ T cell populations reactive to the SARS‐CoV‐2 spike glycoprotein‐derived peptides.