CD8A and COVID-19: The fact that the frequencies of A2/S269+CD8+ T cells in COVID-19 patients increased approximately fivefold suggests that these SARS-CoV-2−specific CD8+ T cells proliferated, to some extent, during primary COVID-19, however not to the level of well-established memory CD8+ T cell populations directed at other viral epitopes like IAV-specific A2/M158 and EBV-specific A2/BMLF1280.