A first aspect of the invention relates to a conjugate comprising: (i) mannan； and (ii) at least one epitope comprising a peptide fragment of a protein selected from myelin basic protein (MBP), myelin oligodentrocyte glycoprotein (MOG) and proteolipid protein (PLP), said peptide fragment being in linear or cyclic form； wherein said epitope is linked to mannan via a[(LyS-Gly)n] bridge, where n is an integer from 1 to 10. Further aspects of the invention relate to pharmaceutical compositions comprising said conjugates, and their use in the preparation of a medicament for treating an immune disorder.
