IFNG and COVID-19: We performed PCA (principal component analysis) of IFNγ, IL-2, TNFα, IL-1α, IFNβ, IL-6, IL-17A, IL-10, CXCL-10 and VEGF to determine the discriminatory power of plasma cytokines, chemokines and growth factors in distinguishing in children with PIMS-TS from COVID-19, seropositive and control children (Fig. 4).