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Healthy adults &gt; or = 50 years old were immunized with either pentavalent Corynebacterium diphtheriae C7 (beta197) cross-reactive material (CRM197) protein-conjugated pneumococcal vaccine (CV) containing 10 microgram each of capsular oligosaccharides from serotypes 6B, 14, 18C, 19F, and 23F or with licensed (23-valent, 25 microgram/serotype) pneumococcal polysaccharide vaccine (PV). Adverse reactions, predominantly local in nature, occurred in 20 of 23 CV recipients versus 13 of 23 PV recipients (P&lt;.05). Compared with mean postvaccination antibody concentrations in PV recipients, those induced by CV were not significantly different for serotypes 6B, 14, 18C, and 23F and were lower for 19F (P&lt;.05). Six months later, reimmunization with PV of subjects who had initially received CV elicited a slight boost in antibody concentrations to levels that were not significantly higher than those achieved after the primary vaccination or than those in persons given a single dose of PV. Pneumococcal vaccines containing protein-conjugated oligosaccharides may offer no advantage over currently licensed preparations containing unconjugated polysaccharides for immunization of healthy older adults.

Reactogenicity and Immunogenicity of a Protein-Conjugated Pneumococcal Oligosaccharide Vaccine in Older Adults