The upregulated genes in T1DM and COVID-19 convalescence were mainly clustered in “hemoglobin metabolic process”, “interleukin-18 production”, “iron ion homeostasis”, and “positive regulation of T cell differentiation”; the downregulated genes were mainly involved in “regulation of neuron projection development”, “steroid metabolic process”, “activation of immune response”, and “other biological processes” (Figure 3A, Supplementary Table 2). This evidence concerns the gene IL18 and type 1 diabetes mellitus.