Figure 2. Geometric mean titers for rSBA at pre-vaccination, at 1 mo¹ and 15 mo¹ after primary vaccination (ATP cohort for persistence) and at 1 mo after the polysaccharide challenge (ATP cohort for immune memory). Notes: ATP, according to protocol; ACWY_T, toddlers primed with MenACWY-TT at 12–14 mo of age; MenCCRM, toddlers primed with MenC-CRM₁₉₇ at 12–14 mo of age; ACWY_C, children primed with MenACWY-TT at 3–5 y of age; MenPS, children primed with MenPS at 3–5 y of age; Errors bars, exact 95% confidence interval; Month 0, pre-primary vaccination; Month 1, 1 mo post-primary vaccination; Month 15, 15 mo post-primary vaccination; Month 16, one month post-polysaccharide challenge. ¹These numbers are not the same as those presented in the previous publication at the same timepoints because the analyses for the present study were conducted on the ATP cohorts for persistence and immune memory (Month 15) and in the previous publication the analyses were performed on the ATP cohort for immunogenicity (Month 1). *Statistically significantly higher values compared with the control group (exploratory analysis)