CD4 and COVID-19: When compared to unexposed HD, we did not observe any statistically significant differences in the basal populations of unstimulated naïve (CD45RA+CD62L+), effector (CD45RA+CD62L-), central memory (TCM; CD45RA-CD62L+) and effector memory (TEM; CD45RA-CD62L-) subsets of the CD3+CD4+ and CD3+CD8+ T cells in the COVID-19 patients (Supplemental Figure 1).