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The mucosal delivery of antigens requires an effective adjuvant to induce mucosal immunity. Current mucosal adjuvants include cholera toxin (CT) and Escherichia coli heat-labile toxin. Unmethylated CpG immunostimulatory oligodeoxynucleotides (ODNs) have been proposed as novel mucosal adjuvants. In this study, mice were immunized with sonicated Helicobacter felis with CT and/or CpG ODN adjuvants. All groups receiving either adjuvant singly or in combination developed increased serum anti-H. felis immunoglobulin G (IgG). The addition of either CpG or CT, or both, produced a specific fecal anti-H. felis IgA response, with the highest IgA levels occurring in animals immunized intranasally with sonicated H. felis with CT and CpG. Following H. felis challenge, addition of the adjuvant CpG ODN provided no significant protection, while groups given CT showed a high degree of protection, although not complete. When CpG ODN was combined with CT and the vaccine combination was delivered intranasally, no bacterial colonization was detected by quantitative PCR, providing "sterile immunity" and demonstrating synergy between CpG ODN and CT.

Mucosal Immunization with Helicobacter , CpG DNA, and Cholera Toxin Is Protective