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Streptococcus pneumoniae is a leading cause of pneumonia among children. However, owing to diagnostic limitations, the protection conferred by pneumococcal conjugate vaccines (PCVs) against pediatric pneumonia attributable to vaccine-serotype pneumococci remains unknown. We analyzed data on vaccination and nasopharyngeal pneumococcal detection among children 5 years old with community-acquired alveolar pneumonia (CAAP; "cases" and those without respiratory symptoms ("controls", who were enrolled in population-based prospective su