: numbers of subjects with available data, %: percentage of subjects with titre within the specified range, 95% CI: 95% confidence interval, GMT: Geometric Mean Titre, PD2: one month after dose 2 (Primary ATP cohort for immunogenicity), PD3: one month after dose 3 (Primary ATP Cohort for Immunogenicity), Pre-Ch: just prior to meningococcal polysaccharide challenge (ATP Cohort for Persistence), Post-Ch: one month after meningococcal polysaccharide challenge (ATP Cohort for Immunogenicity), Pre-B: just prior to the booster vaccination (ATP Cohort for Persistence), Pre-B*: just prior to the booster vaccination (ATP Cohort for Immunogenicity), Post-B: one month after booster vaccination (Booster ATP Cohort for Immunogenicity), Post-B (Y1): one year after booster vaccination (ATP Cohort for Persistence Year 1), Post-B (Y2): two years after booster vaccination (ATP Cohort for Persistence Year 1), Pre-Vac: just prior to the vaccination (Vaccination ATP cohort for Immunogenicity), Post-Vac: one month after vaccination (Vaccination ATP cohort for Immunogenicity), Post-Vac (Y1): one year after vaccination (ATP cohort for Persistence Year 1), Results of this table were previously published [62, 68–76].