N19 polyepitope as a carrier for enhanced immunogenicity and protective efficacy of meningococcal conjugate vaccines |
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Authors: | Baraldo Karin Mori Elena Bartoloni Antonella Petracca Roberto Giannozzi Aldo Norelli Francesco Rappuoli Rino Grandi Guido Del Giudice Giuseppe |
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Affiliation: | Research Center, Chiron Vaccines, via Fiorentina 1, 53100 Siena, Italy. |
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Abstract: | N19, a string of human universal CD4 T-cell epitopes from various pathogen-derived antigens, was shown to exert a stronger carrier effect than CRM197 for the induction of anti-group C Neisseria meningitidis capsular polysaccharide (MenC), after immunization of mice with various dosages of N19-MenC or CRM-MenC conjugate vaccines. After two immunizations, the N19-based construct induced anti-MenC antibody and protective bactericidal antibody titers higher than those induced by three doses of the CRM-MenC conjugate and required lower amounts of conjugate. N19-based conjugates are superior to CRM-based conjugates to induce protective immune responses to MenC conjugates. |
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