The purpose of the study was to evaluate the impact of pneumococcal vaccination (PCV) with PCV7 and PCV13 on the incidence of hospitalization due to sinusitis, bacterial pneumonia, and empyema.

The study included all children hospitalized with sinusitis, pneumonia, or empyema in Stockholm County between July 2003 and June 2012.

This was a retrospective, population based study in which the children were identified by International Classification of Diseases, 10th Revision–coded hospital registries. Discharge codes used were J13–J18 (bacterial pneumonia or pneumonia unspecified), J86 (empyema), or J01 (sinusitis). Pyelonephritis was used as a control for the effect of PCV on number of admissions. The number of children admitted with asthma, RSV, and viral pneumonia were also recorded to control for possible changes in diagnostics. The children were divided into age groups 0 to <2, 2 to <5, and 5 to <18.

Between July 2003 and June 2012, 678 children were...

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