Figure 3. Serotype distribution of invasive pneumococcal disease cases among children born after April 1, 2006 (age eligible for 7-valent pneumococcal conjugate vaccine [PCV-7]) in the postimplementation period compared with age-matched children in the preimplementation period, the Netherlands. Preimplementation period, June 2004–June 2006; postimplementation period, June 2006–June 2008; other serotypes are 15A, 16F, 22F, 3, 33F, 5, and 9N. *p<0.05; preimplementation vs. postimplementation periods. Proportions calculated using Fisher exact test; all p values are 2 sided.