Immunogenicity was measured as the percentages of overall subjects with hSBA (human serum bactericidal assay) seroresponse, directed against Neisseria meningitidis (N meningitidis) serogroups A, C, W and Y, 28 days after one vaccination of MenACWY-CRM (day 29). The seroresponse is defined as the percentages of subjects achieving hSBA ≥1:8 postvaccination with a prevaccination hSBA \<1:4 and the percentages of subjects achieving at least four-fold increases in postvaccination hSBA from day 1 in subjects with a baseline hSBA ≥1:4

Assessment was made to demonstrate the non-inferiority of hepatitis A/B vaccine with MenACWY-CRM as compared to hepatitis A/B vaccine without MenACWY-CRM, as measured by geometric mean concentrations on day 57 in previously unvaccinated subjects or on day 29 after a booster dose in previously vaccinated subjects.

The percentage of subjects with persisting serum bactericidal antibody (hSBA)titers ≥1:8 against Neisseria meningitidis serogroups A,C,W,Y, 13-33 months after receiving either one or two doses of MenACWY-CRM conjugate vaccine or one dose of MenC vaccine in parent study, is reported. The functional bactericidal antibodies response against N. meningitidis serogroups was measured with the serum bactericidal assay using human complement (hSBA)

The serum antibody response following a booster dose of MenACWY-CRM conjugate vaccine in children, who had previously received either one or two doses of the same vaccine in the parent study, is reported as percentage of subjects with hSBA titers ≥1:8 against N. meningitidis serogroups A,C,W,Y.

The serum antibody titers following a booster dose of MenACWY-CRM conjugate vaccine in children, who had previously received either one or two doses of the same vaccine in the parent study, are reported as geometric mean titers (GMTs) against N. meningitidis serogroups A,C, W,Y.

The serum antibody response following a dose of MenACWY-CRM conjugate vaccine in children, who had previously received one dose of MenC vaccine in the parent study, is reported as percentage of subjects with hSBA titers ≥1:8 against N. meningitidis serogroups A,C, W,Y

The serum antibody titers following one dose of MenACWY-CRM conjugate vaccine in children, who had previously received one dose of MenC vaccine in the parent study, are reported as GMTs against N. meningitidis serogroups A,C,W,Y

The immune response was assessed in terms of percentage of subjects with hSBA ≥ 1:8 against N. meningitidis serogroups A, C, W and Y following 4 doses of Men ACWY vaccine given to infants at 2, 4, 6 and 12 months of age.

The immune response was assessed in terms of percentage of subjects with hSBA ≥ 1:8 against N. meningitidis serogroups A, C, W and Y following 4 doses of Men ACWY vaccine given to infants at 2, 4,6 and 12 months of age and 3 doses of Men ACWY given to infants at 2, 4 and 12 months of age.

Immunogenicity was measured as the percentage of subjects who achieved hSBA titer ≥1:8 against meningococcal serogroup A, C, W and Y, evaluated by serum bactericidal assay using human complement (hSBA), at baseline and one month after toddler dose of MenACWY-CRM administered at 12 months of age. The immune response was considered sufficient if the lower limit of the two-sided 95% confidence intervals (CIs) for the percentage of subjects with hSBA titer ≥1:8, at one month after toddler vaccination, was greater than 85% for the serogroup C, W, or Y and greater than 80% for the serogroup A.

Reactogenicity of MenACWY-CRM and comparator MenACWY-TT vaccine was assessed in subjects (12 to 15 months old) as measured by number of subjects with at least one severe solicited AE within 7 days after vaccination. Solicited AEs included tenderness, erythema, induration, irritability, sleepiness, change in eating habits, vomiting, diarrhea and fever.

The memory B cell response at one month after primary vaccinations (5 months of age) was defined as the mean number of meningococcal serogroup A, C, W-135 and Y specific memory B cells, measured in vitro by ELISpot assay per 2x100000 lymphocytes obtained from culture (LOC) of peripheral blood mononuclear cells (PBMC) circulating in blood incubated for 5.5 days in the presence of polyclonal B cell activators. Serogroup A, C, W-135 and Y geometric mean titers (GMTs) were measured by serum bactericidal assay using human complement (hSBA) at 12 months of age (before third dose). Correlation and linear regression coefficients were determined between memory B cells at 1 month after primary vaccinations with MenACWY-CRM (5 months of age) and hSBA titers at 12 months of age (before third dose) for the serogroups A, C, W-135 and Y.

Geometric mean titers(GMT) and the respective confidence intervals measured after each vaccination against the three different meningococcal strains.

Percentage of participants with serum bactericidal activity (SBA) of the Meningococcal ACWY vaccine at one month after vaccination against A, C, W-135 and Y strains. Bactericidal activity (% ≥ 1:4, i.e., percentage of subjects with BCA titer ≥ 1:4; % ≥ 1:8, i.e. percentage of subjects with BCA titer ≥ 1:8) against a panel of genetically distinct meningococcal B strains: * prior to the first vaccination * 30 days following the first, second, prior to the third and 30 days after the third vaccination

Geometric mean titer (GMT) of the Meningococcal ACWY Vaccine at One Month After the Immunization against the A, C, W-135 and Y strains.

Percentage of participants with serum bactericidal activity (SBA) of the Meningococcal ACWY vaccine at one month after vaccination against A, C, W-135 and Y strains. Bactericidal activity (% ≥ 1:4, i.e., percentage of subjects with BCA titer ≥ 1:4; % ≥ 1:8, i.e. percentage of subjects with BCA titer ≥ 1:8) against a panel of genetically distinct meningococcal B strains: * prior to the first vaccination * 30 days following the first, second, prior to the third and 30 days after the third vaccination

The number of subjects who reported solicited reactions after the administration of the Meningococcal B vaccine at a 0, 2, 6-month schedule and the administration of the Meningococcal A, C, W, and Y vaccine at month 7.