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.
Keywords: Influenza; Streptococcus pneumoniae; pneumococcal disease; respiratory virus; serotypes.
© 2014 The Authors Clinical Microbiology and Infection © 2014 European Society of Clinical Microbiology and Infectious Diseases.