It is interesting to note that the top ten cytokines/chemokines selected by the robust L1-regularized logistic model for differentiating COVID-19 from MIS-C include MIG, IP-10 and IL-15, which are three of the five cytokines/chemokines elevated in both diseases, with significantly greater elevation in MIS-C. This evidence concerns the gene CXCL9 and COVID-19.