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Comparison of naturally acquired (preimmunization) (left panels) and vaccine-induced (III-TT, n = 30; IIIPS, n = 30) (right panels) IIIPS-specific antibodies in human sera as quantitated by IgG ELISA (y axis) and by RABA (x axis). The coating antigens used in the ELISAs are shown in the upper left corner of each panel. CPS, capsular polysaccharide.
