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Percentages of subjects with booster responses for serogroups A, C, W, and Y at 1 month after 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.
