Abstract
Following primary and booster vaccination with an 11-valent pneumococcall protein D conjugate vaccine there was a 42.8% (95% CI: −16.7 to 71.9, ns) reduction in the carriage of Streptococcus pneumoniae vaccine serotypes and a 42.6% (95% CI: 1.3–66.6) reduction in the carriage of Haemophilus influenzae identified by standard microbiological techniques. When PCR and immunoblot assays were used to further improve specificity of non-typeable H. influenzae strain identification, carriage of H. influenzae was still reduced with 38.6% (95% CI: −6.3 to 64.6, ns). Reduction of acute otitis media (AOM) episodes preceded the impact on carriage. These data provide further support of the functional role of the protein D immunity.
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