Proportion of infants achieving Hib IgG concentrations ⩾ 0.15 and ⩾ 1.0 μg/ml after primary immunisations and after additional fourth dose of Hib conjugate vaccine
| Hib IgG (μg/ml) | After primary immunisations (n = 122) | After fourth dose (n = 96) |
|---|---|---|
| ⩾ 0.15 | 58% | 95% |
| ⩾ 1.0 | 21% | 85% |