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Percentages of subjects with rSBA titers (A) ≥1:8 and (B) ≥1:128 at Year 10 (before booster) and at 1 month after a booster dose of MenACWY-TT (booster ATP cohort). ATP = according-to-protocol; MenACWY-PS = quadrivalent meningococcal polysaccharide vaccine; MenACWY-TT = quadrivalent meningococcal tetanus toxoid conjugate vaccine; rSBA = serum bactericidal antibody assay using baby rabbit complement.
