Abstract: The present invention provides an antigen chimera, comprising: a fusion protein of an antigen and a mucosal immune adjuvant protein monomer capable of forming a multimer; and the mucosal immune adjuvant protein monomer capable of forming the multimer; wherein the mucosal immune adjuvant protein monomer capable of forming the multimer is one selected from cholera toxin B subunit (CTB) and E. coli heat-labile enterotoxin B subunit (LTB), the multimer is a pentamer, and in the chimera the molar ratio between the fusion protein and the mucosal immune adjuvant protein monomer capable of forming multimers is 1:4. In the present invention, a characteristic that a mucosal immune adjuvant protein can form a pentamer is used to form a chimeric structure, so as to form an antigen having a higher potency. Moreover, a mucosal immune adjuvant protein is used to improve an immune effect, so as to improve an effect of enhancing antigen immunogenicity.

Abstract: The present invention provides an antigen chimera, comprising: a fusion protein of an antigen and a mucosal immune adjuvant protein monomer capable of forming a multimer; and the mucosal immune adjuvant protein monomer capable of forming the multimer; wherein the mucosal immune adjuvant protein monomer capable of forming the multimer is one selected from cholera toxin B subunit (CTB) and E. coli heat-labile enterotoxin B subunit (LTB), the multimer is a pentamer, and in the chimera the molar ratio between the fusion protein and the mucosal immune adjuvant protein monomer capable of forming multimers is 1:4. In the present invention, a characteristic that a mucosal immune adjuvant protein can form a pentamer is used to form a chimeric structure, so as to form an antigen having a higher potency. Moreover, a mucosal immune adjuvant protein is used to improve an immune effect, so as to improve an effect of enhancing antigen immunogenicity.