The expression of ABO, H, Lewis and secretor histo-blood group carbohydrates is capable of producing at least three biological effects of medical importance: structural modification of precursor oligosaccharides, expression of a distinct carbohydrate tissue profile and potent natural antibodies.15 These effects influence susceptibility to infections, since these carbohydrates act as receptors for microorganisms or other substances (toxins, allergens, etc.).9 Therefore these biological events represent a vast field for medical research and technologies.