Abstract: An immunomodulator which includes an antigen-presenting-cell (APC) targeting molecule coupled to an immunomodulatory antigen, wherein the APC-targeting molecule mimics a superantigen but does not include a fully functional T-cell receptor binding site. Also disclosed are a method of therapeutic or prophylactic treatment of a disorder, including administrating to a subject in need thereof a pharmaceutical composition or a vaccine containing the immunomodulator; use of the immunomodulator for the preparation of a medicament for the therapeutic or prophylactic treatment of a disorder; and a method of preparing the immunomodulator.