Timing of immunisations and serum samples
| Age in days Median (IQR) | |
|---|---|
| First Hib immunisation | 65 (60–89) |
| Second Hib immunisation | 97 (92–121) |
| Third Hib immunisation | 143 (127–170) |
| First blood sample and fourth Hib immunisation | 205 (164–218) |
| Second (post-fourth Hib) blood sample | 255 (229–274) |
| Days between fourth Hib and second blood sample | 54 (31–59) |