Volume 12, Number 6—June 2006
Research
Haemophilus influenzae Type b Reemergence after Combination Immunization
Figure 2

Figure 2. Anti-polyribosyl-ribitol phosphate antibody concentrations in 2- to 4-year-old children, according to number of doses of acellular pertussis containing Haemophilus influenzae type b combination vaccines received in infancy. Proportion achieving different concentrations is shown.