To describe the immune response of preterm infants, with a reduced response to primary Haemophilus influenzae type B (Hib) immunisation, to a fourth dose of Hib conjugate vaccine given in early life.
Prospective observational study.
Five Wessex Neonatal Units.
Infants born at < 32 weeks and immunised with three doses of combined …
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Online ISSN 1470-2738
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