Mutation in FUT2, autosomal recessive, resulting in nonsecretion of ABO blood group antigens in secretions and on mucosal surfaces in Caucasians
Usually listed as rs601338 (A;A)
Nonsecretor of blood group antigens by phenotypic testing
Does not get currently circulating strains of norovirus because stomach lacks receptor for virus (H type-1 oligosaccharide ligand required for Norwalk virus binding)
