IFN-α2b (aerosol): Faster viral clearance and reduced inflammatory response (34)IFN-β1b (subcutaneous), LPV/r, ribavirin: Faster viral clearance and reduced inflammatory response (13)IFN-β1a (subcutaneous): Increased discharge rate and decreased mortality in severe COVID-19 (36)IFN-κ (aerosol) plus TFF2: Faster recovery, viral clearance, and discharge (38) IFN-λ: In progress. This evidence concerns the gene IFNK and COVID-19.