| Invasive potential | Other serotypes | ||
| High | Low | ||
| Need for vasopressor | 25.8 | 44.8 | 34.0 |
| Mechanical ventilation | 12.9 | 25.6 | 13.8 |
| Severe pneumonia | 26.8 | 51.2 | 34.9 |
| 30-day case fatality rate | 3.2 | 25.6 | 7.3 |
Data are presented as %. High invasive disease potential serotypes included serotypes 1, 5 and 7F; low invasive disease potential serotypes included 3, 6A, 6B, 8, 19F and 23F. Data taken from [55].