Haemophilus influenzae Type b Reemergence after Combination Immunization
Nik G. Johnson*, Jens U. Ruggeberg*, Gail F. Balfour*, Y. Chen Lee†, Helen Liddy‡, Diane Irving‡, Joanna Sheldon‡, Mary P.E. Slack§, Andrew J. Pollard†, and Paul T. Heath*
Author affiliations: *St George's University of London, London, United Kingdom; †University of Oxford, Oxford, United Kingdom; ‡St. George's Hospital, London, United Kingdom; §Health Protection Agency Centre for Infections, London, United Kingdom
Figure 1. Geometric mean anti-polyribosyl-ribitol phosphate antibody concentration before booster (95% confidence intervals) in 2- to 4-year-old children, according to number of doses of acellular pertussis (aP) containing Haemophilus influenzae type b combination vaccines received in infancy. Number of participants is shown in parentheses. GMC, geometric mean concentration.
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