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Comparison of anti-PRP IgG titer with SBA titers in sera after 2 doses of PRP-T vaccine (n=20 serum samples) (A), sera after 3 doses of PRP-T vaccine (n=21 serum samples) (B) and sera after 2 doses of PRP-OMP vaccine (n=21 serum samples) (C). The vertical and horizontal dotted lines represent the detection limit of anti-PRP IgG antibody assay (0.15 µg/mL) and serum bactericidal assay (2), respectively.
