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It is not known how long children with Haemophilus influenzae serotype b (Hib) vaccine failure retain protective Hib antibody concentrations after infection. The objective of this study was to determine Hib antibody concentrations in children several years after infection and to identify risk factors for low antibody concentrations.

Long‐Term Immunological Follow‐Up of Children withHaemophilus influenzaeSerotype b Vaccine Failure in the United Kingdom