Patent ID: 6960344

Claim:
A method of enhancing an immune response in an animal, comprising administering to an animal in need of such enhancing a polysaccharide conjugate in an amount effective to enhance the immune response of said animal, wherein said polysaccharide conjugate consists essentially of: (i) a polysaceharide which binds to the surface of Antigen Presenting Cells (APCs) wherein said polysaceharide comprises a minimum of seven saccharides; and (ii) one or more molecules having an aldehyde or ketone group, wherein said molecules having an aldehyde or ketone group are selected from the group consisting of aromatic aldehydes, aromatic ketones, heteroaromatic ketones, and heteroaromatic aldehydes; wherein polysaccharide (i) is attached to molecules (ii) through (iii) a direct covalent bond or covalently via a bifunctional linker in a manner that keeps the aldehyde or ketone group intact.