Table.

Geometric mean titre (95% confidence interval) of Haemophilus influenzae type b polysaccharide IgG, and the number (percentage) of infants with antibody titres below the minimum protective concentration (0.15μg/ml) or above the long term protective concentration (1.0μg/ml) after primary immunisation with three doses of conjugate vaccine, and immediately before and 1 month after a booster dose of the vaccine given at 1 year of age

	No	Geometric mean titre	Antibody titre
			<0.15μg/ml	>1.0μg/ml
After primary immunisation	516	6.23 (5.53 to 7.01)	10 (2)	478 (93)
Immediately before booster dose	401	0.41 (0.35 to 0.47)	153 (38)	126 (31)
1 month after booster dose	387	108.39 (91.62 to 128.23)	7 (2)	380 (98)