Dynamics of Streptococcus pneumoniae serotypes causing acute otitis media isolated from children with spontaneous middle-ear drainage over a 12-year period (1999-2010) in a region of northern Spain.

The prevalence of serotypes 1, 5 and 7F, included in the 10-valent PCV (PCV10) but not in the PCV7, was low (equal to or under 4% for each serotype); however, when considered all together, these serotypes showed an increasing trend over the study period (p for trend p = 0.003).

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