CD4 and COVID-19: As shown in Figure 14C,B cells memory (p < .01), Dendritic cells activated (p < .05), Macrophages M0 (p < .001), and T cells CD4 naïve (p < .0001) were higher expressed in COVID‐19 patients than in healthy controls, while Natural killer (NK) cells activated (p < .05) and T cells CD8 (p < .0001) were downregulated in COVID‐19.