Abstract

In order to determine if the novel influenza A(H1N1)pdm09 was associated with temporal trends of main serotypes causing invasive pneumococcal disease (IPD), we studied 384 episodes of IPD in <18-year-old patients from 2007 to 2012. The number of IPD episodes diagnosed during the 2009 pandemic period meant almost one-third of all the episodes diagnosed in the five included influenza periods (51/156). The number of IPD episodes diagnosed during the 2009 pandemic period meant almost one-third of all the episodes diagnosed in the five included influenza periods. Most of them occurred in <5-year-old children. Serotype 1 was the main serotype detected over the period, except for the 2009 pandemic, when it practically disappeared. Seasonality and viral infections could trigger temporal trends of serotypes causing IPD.

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