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With a retrospective study of invasive pneumococcal disease (IPD) surveillance data representative for ∼25% of the Dutch population (1275 hospitalized cases) over the period June 2004–June 2006 prior to the implementation of the 7-valent pneumococcal conjugate vaccine (PCV7), the aim was to provide baseline data on IPD for the interpretation of changes after implementation of conjugate vaccines. The...
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