title: Non-secretion of ABO blood group antigens predisposing to infection by Haemophilus influenzae.
mesh_terms: D000017:ABO Blood-Group System / Q000276:immunology*; D004198:Disease Susceptibility; D006192:Haemophilus Infections / Q000276:immunology*; D006801:Humans; D007519:Isoantigens / Q000032:analysis*; D012463:Saliva / Q000032:analysis
chemical_list: D000017:ABO Blood-Group System; D007519:Isoantigens