Patent ID: 7972645

Claim:
An immunogenic composition comprising an antigen agent and an adjuvant agent, wherein the adjuvant agent contains a DsCE-I extract that is prepared from a tuber of a Dioscorea plant by a process including: (a) obtaining an aqueous extract of a tuber of Dioscorea plant; (b) extracting the extract of part (a) with an aqueous solution containing 50% ethanol to form a first supernatant and a first ethanol-insoluble fraction; and (c) collecting the first ethanol-insoluble fraction, wherein the first ethanol-insoluble fraction is DsCE-I, and wherein the Dioscorea plant is D. batatas Decne, D. alata L., D. pseudojaponica , or D. alata L. var, purpurea (Roxb.) M. Pouch.