Nasopharyngeal Pneumococcal Carriage after Combined Pneumococcal Conjugate and Polysaccharide Vaccination in Children with a History of Recurrent Acute Otitis Media

Abstract
Background. We recently showed that vaccination with a 7-valent pneumococcal conjugate vaccine (PCV7) followed by a 23-valent pneumococcal polysaccharide vaccine (PPSV23) failed to prevent new episodes of acute otitis media (AOM) in previously unvaccinated toddlers and children with a history of recurrent AOM. We describe in detail the impact of pneumococcal vaccinations on nasopharyngeal carriage of S. pneumoniae in this study population.

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