A Venn diagram analysis helped us identify 10 crucial genes (VNN1, GBP4, XAF1, OAS1, OAS2, OAS3, RTP4, IFI44L, IFIT1 and RSAD2) intersecting with the commonly expressed DEGs in both COVID-19 and tuberculosis (Figure 4C). The gene discussed is OAS1; the disease is COVID-19.