CD4 and COVID-19: The Th cells (CD3+CD4+) (Figure S3A) and Ts cells (CD3+CD8+) (Figure S3B) were significantly lower in the ICU COVID-19 patients compared to the non-ICU COVID-19 patients from the admission to hospital to day 7 (p = 0.002 and p < 0.001, respectively, for Th cells, p < 0.001 and p = 0.003, respectively, for Ts cells).