FUT2 and viral infectious disease: Single nucleotide variants (SNV) that redutce susceptibility to virus infection include a P424A substitution in the filovirus endosomal fusion receptor Niemann-PickC1 (NPC1) [6, 7], and a G428A mutation in fucosyltransferase 2 (FUT2) that renders homozygous carriers resistant to norovirus [8, 9].