| Serotype | 2006/2007 (n=74) | 2009/2010 (n=107) | Incidence rate ratio (95% CI) |
| 1 | 46 | 50 | 1.09 (0.71 to 1.66) |
| 3 | 11 | 35 | 3.18 (1.58 to 6.93)* |
| 4 | 1 | 0 | 0.33 (0 to 15.41) |
| 5 | 0 | 2 | 4.99 (0.21 to 6625) |
| 7A/F | 0 | 10 | 20.96 (1.83 to 22872)* |
| 14 | 6 | 0 | 0.08 (0 to 1.00)* |
| 19A | 5 | 7 | 1.40 (0.38 to 5.58) |
| 23F | 1 | 0 | 0.33 (0 to 15.41) |
| 6A/C | 0 | 1 | 2.99 (0.07 to 4600) |
| 6B | 3 | 0 | 0.14 (0 to 2.52) |
| 9V | 1 | 0 | 0.33 (0 to 15.41) |
| Non-assay serotype | 0 | 2 | 4.99 (0.21 to 6625) |
| Serotype | 2006/2007 (n=74) | 2009/2010 (n=107) | p Value |
| PCV—7 | |||
| PCV-7 serotypes | 12 (16%) | 0 | <0.001 |
| Non PCV-7 serotypes | 62 (84%) | 107 (100%) | |
| PCV—13 | |||
| PCV-13 serotypes | 107 (98%) | 2 (1.8%) | 0.68 |
| Non PCV-13 serotypes | 108 (96%) | 4 (3.6%) | |
↵* Denotes statistical significance.