ACE 2 - angiotensin-converting enzyme 2; APN - aminopeptidase N; DCs dendritic cells; DC-SIGN – Dendritic Cell-Specific Intercellular adhesion molecule-3-Grabbing Non-integrin (CD209), DC-SIGNR – DC-SIGN receptor; DPP4- dipeptidyl peptidase 4; GI - gastrointestinal; HLA-C – human leukocyte antigen C; IFIT - interferon-induced proteins with tetratricopeptide repeats; TMPRSS - type II transmembrane serine proteases, URTI – upper respiratory tract infection.