Figure 2. Observed and simulated incidence of invasive Haemophilus influenzae type b in children <5 years of age in 3 populations: (A) United States; (B) England and Wales; (C) Alaska Natives. PRP-OMP, Hib polyribosylribitol phosphate polysaccharide conjugated to Neisseria meningitidis outer membrane protein; HbOC, Haemophilus b conjugate vaccine; PRP-T, polyribosylribitol phosphate polysaccharide conjugated to tetanus toxoid.
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