CD4 and COVID-19: The children with MISC_A had higher CD4+IL-2+/million CD3+ values (p-value: 0.03) compared to convalescent COVID-19, higher CD8+IL-2+/million CD3+ (p-value: 0.05) compared to healthy controls, and higher CD4−CD8−IL-2+/million CD3+ median (IQR) values compared to MISC_C (p-value: 0.03) (Supplementary Table S2).