Objective To optimize the procedure for preparation of group C meningococcal polysaccharide(GCMP)-tetanus toxoid(TT) conjugate vaccine.Methods GCMP-TT conjugates were prepared by binding degraded GCMP derivative to TT(PSAH-TT),TT derivative to degraded GCMP(PS-AHTT),and degraded GCMP after activation with 1-cyano-4(dimethylamino)-pyridinium tetrafluoroborate(CDAP) and derivation to TT(PSCDAPAH-TT),respectively,then determined for biochemical indexes and antigenicity.The immunogenicity of prepared conjugates...