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Correlations between IRPA and functional (SBA) (a) or quantitative antibody (b to d) assays for prevaccination sera from Icelandic teenagers (n = 26). Strain Cu385 (B:4:P1.19,15) was used in IRPA and SBA analyses and for preparing the OMVs. (a) SBA titers versus PIs; (b) anti-OMV IgG concentrations versus PIs; (c) anti-B-PS IgG concentrations versus PIs; (d) anti-B-PS IgM concentrations versus PIs.
