CD4 and COVID-19: We found follicular helper T cells, gamma delta T cells, naive CD4 T cells, activated NK cells, and memory B cells significantly increased in COVID-19 patients and resting NK cells, plasma cells, M0, M1, and M2 macrophages, memory CD4 T cells, CD8 T cells, naive B cells, activated dendritic cells, and eosinophils significantly decreased in COVID-19 patients (Figure 3D).