Fig. 2

The prevalence of carriage by vaccine-type per study year, expressed per 100 children. The arrows indicate the timing of vaccine introduction (PCV7 in 2006, PCV13 in 2011). PCV7 = carriage of serotypes covered by the 7-valent pneumococcal conjugate vaccine; PCV13–7 = carriage of serotypes covered by the 13-valent pneumococcal conjugate vaccine but not by the 7-valent vaccine: NVT = carriage of serotypes not covered by the 13-valent pneumococcal conjugate vaccine