MiRNAs that were downregulated in serum of COVID-19 patients mainly target genes promoting angiogenesis (e.g., VEGFA, ANGPT2, COL4A1, FGF2, ZEB1), apoptosis, autophagy, stress response (e.g., ATG12, ATG14, ATG2B, SOD2, TXNIP), and inflammation (e.g., CXCL9, CXCL10, IL1R1, TNF). Here, ATG2B is linked to COVID-19.