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