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  • Title: Concomitant administration of recombinant PsaA and PCV7 reduces Streptococcus pneumoniae serotype 19A colonization in a murine model.
    Author: Whaley MJ, Sampson JS, Johnson SE, Rajam G, Stinson-Parks A, Holder P, Mauro E, Romero-Steiner S, Carlone GM, Ades EW.
    Journal: Vaccine; 2010 Apr 19; 28(18):3071-5. PubMed ID: 20206671.
    Abstract:
    A murine colonization model was used to determine the effect of co-administering 7-valent polysaccharide-protein conjugate vaccine and pneumococcal surface adhesin A. Mice were challenged intranasally with either PCV7 serotypes, 4 or 14, or a non-PCV7 serotype, 19A. Post-challenge samples were evaluated for IgG antibody levels, opsonophagocytic activity, and nasopharyngeal colonization. No interference was observed between immune responses from the concomitant and individual immunizations. Concomitant immunizations reduced carriage for tested serotypes; largest reduction was observed for 19A. From these mouse studies, co-administering pneumococcal antigens appear to expand coverage and reduce colonization against a non-PCV7 serotype without inhibiting immunogenicity to other serotypes.
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