CD8A and COVID-19: Those with MIS-C also exhibited a reduced frequency of CD8+ T cells responding to CD8-A MP compared with those with convalescent COVID-19 (P = 0.045) and had the lowest frequency of CD8+ T cells responding to the CD8-B MP epitopes (P = 0.007 and P = 0.02 compared with convalescent COVID-19 and HC, respectively) (Figure 1E).