CD8A and COVID-19: Indeed, while too few T cells were available to test other specificities concurrently for the COVID-19 patients, these frequencies of SARS-CoV-2−specific CD8+ T cells were significantly lower than those found for influenza A virus (IAV)-specific (1.39 × 10−4 for A2/M158; n = 6) and Epstein–Barr virus (EBV)-specific (1.38 × 10−4 for A2/BMLF1280; n = 6) memory T cell populations from uninfected controls (Fig. 3 B and D), and as per previous publications (19, 20).