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Print version ISSN 1025-028X


CHANG, Janoi et al. Characterization of capsular polysaccharide immunogenic conjugates from Streptococcus pneumoniae serotype 14. Vaccimonitor [online]. 2013, vol.22, n.1, pp.15-21. ISSN 1025-028X.

Conjugate vaccines consisting of bacterial polysaccharides linked through a covalent bond to a carrier protein have a major impact on childhood immunization schemes which have dramatically decrease the incidence of bacterial infections. In the case of Streptococcus pneumoniae more than 90 serotypes have been reported, based on the structure of the polysaccharide capsules and at least 23 of them have demonstrated clinical importance. A limited number of 7 or more recently 10 and 13 are included in licensed conjugate vaccines. On the other hand, the increasing need for these vaccines worldwide requires the incorporation of new manufacturers who are facing highly complex technology since the entire conjugation process can not affect the structural features for which the polysaccharide is immunologically recognized. Our paper provides a conjugation procedure for the capsular polysaccharide of Streptococcus pneumoniae serotype 14. The process includes fragmentation, peryodic oxidation and subsequent conjugation to tetanus toxoid or diphtheria toxoid to the polysaccharide, each intermediate was characterized by physico-chemical methods. Yields higher than 50% were obtained in all reactions. The conjugates generated high titers of IgG specific antibodies and immunological memory. In conclusion, the procedure allows immunogenic conjugates of serotype 14.

Keywords : Streptococcus pneumoniae; conjugate vaccines; immunogenicity.

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