ANTIBODY PERSISTENCE 12 MONTHS FOLLOWING BOOSTER VACCINATION WITH A QUADRIVALENT MENINGOCOCCAL ACWY TETANUS TOXOID CONJUGATE VACCINE IN HEALTHY CHILDREN

■ Antibody persistence evaluated by rSBA assay 12 months after MenACWY-TT booster vaccination was observed in >97% of children for each serogroup. ■ Antibodies measured by hSBA assay 12 months after MenACWY-TT booster vaccination persisted for each serogroup in >95% of children. ■ These data indicate that additional booster doses of MenACWY-TT could extend the duration of vaccine-induced protection.