CCR7 and long COVID-19: The analysis of phenotypic differentiation of SARS-CoV-2 reactive T cells, defined by the expression or absence of CD45RA and CCR7 (gating strategy, Supplementary Figure S2) showed significantly higher frequencies of S-reactive CD8+ TEMRA cells in PASC patients versus control, whereas other subsets showed no differences between the two cohorts (Figures 2A–H).