Four-fold rise is defined as: - a post-vaccination hSBA titer equal to or higher than (\>=) 16 for participants with a pre-vaccination hSBA titer \<4; - a post-vaccination hSBA titer \>= 4 times the LLOQ for participants with a pre vaccination hSBA titer \>= limit of detection (LOD) but \< LLOQ; and - a post-vaccination hSBA titer \>= 4 times the pre-vaccination titer for participants with a pre-vaccination hSBA titer \>= LLOQ.

Four-fold rise is defined as: - a post-vaccination hSBA titer equal to or higher than (\>=) 16 for participants with a pre-vaccination hSBA titer \<4; - a post-vaccination hSBA titer \>= 4 times the LLOQ for participants with a pre vaccination hSBA titer \>= limit of detection (LOD) but \< LLOQ; and - a post-vaccination hSBA titer \>= 4 times the pre-vaccination titer for participants with a pre-vaccination hSBA titer \>= LLOQ.

Assessed solicited administration site events include injection site pain, erythema, swelling, induration. Any pain = occurrence of the symptom regardless of intensity grade and any erythema, swelling and induration are defined as a symptom with a surface diameter equal to or greater than 25 millimeters.

Assessed solicited administration site events include injection site pain, erythema, swelling, induration. Any pain = occurrence of the symptom regardless of intensity grade and any erythema, swelling and induration are defined as a symptom with a surface diameter equal to or greater than 25 millimeters.

Assessed solicited systemic events include fever \[body temperature \>= 38.0°C (celsius) /100.4°F (Fahrenheit)\], nausea, fatigue, myalgia, arthralgia, headache.

Assessed solicited systemic events include fever \[body temperature \>= 38.0°C/100.4°F\], nausea, fatigue, myalgia, arthralgia, headache.

Unsolicited AE-AE not solicited using an eDiary and spontaneously communicated by a participant/participant's parent(s)/Legally acceptable representative(s) who has signed informed consent. SAEs-events that result in death, life threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in disability/incapacity, is congenital anomaly/birth defect in the offspring of a study participant/results in abnormal pregnancy outcomes. AESIs-predefined AEs of scientific and medical concern specific to the product or program, for which ongoing monitoring and rapid communication by the investigator to the sponsor can be appropriate, because such an event might warrant further investigation in order to characterize and understand it. An MAE is defined as an unsolicited AE for which the participant received medical attention such as hospitalization, or an emergency room visit, or visit to/by a health care provider.

Any AE-untoward medical occurrence in a patient/clinical investigation participant, temporally associated with use of a medicinal product, whether or not considered related to the medicinal product. Unsolicited AE-AE not solicited using an eDiary and spontaneously communicated by a participant/participant's parent(s)/Legally acceptable representative(s) who has signed informed consent. SAEs-events that result in death, life threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in disability/incapacity, is congenital anomaly/birth defect in the offspring of a study participant/results in abnormal pregnancy outcomes. AESIs-predefined AEs of scientific and medical concern specific to the product or program, for which ongoing monitoring and rapid communication by the investigator to the sponsor can be appropriate, because such an event might warrant further investigation in order to characterize and understand it.

SAEs, AEs leading to withdrawal, AESIs and medically attended AEs were assessed throughout the study period are reported in this outcome measure.

The immune response to 2 doses of the MenABCWY vaccine administered on a 0-, 24-month schedule, and a 0-, 48-month schedule is evaluated against each N. meningitidis serogroup B indicator strains.

The immune response to 2 doses of the MenABCWY vaccine administered on a 0-, 24-month schedule, and a 0-, 48-month schedule is evaluated against each N. meningitidis serogroup B indicator strains.

The solicited administration site events include pain, redness, swelling and induration. Redness, swelling, and induration are summarized according to defined severity grading scales: None (0 to 24mm); Mild (25 to 50mm); Moderate (51 to 100mm); Severe (\>100mm). Injection site pain is summarized according to "mild", "moderate" or "severe".

The solicited systemic events include fever, headache, nausea, myalgia, arthralgia and fatigue. Fever is defined as body temperature 38.0°C (100.4°F). The preferred location for measuring temperature in this study is the oral route. Solicited systemic events (except fever) are summarized according to "mild", "moderate" or "severe".

An unsolicited AE is an AE that was not included in a list of solicited events and must have been spontaneously communicated by a participant/participant's parent(s)/ Legally Acceptable Representative(s) who has signed the informed consent. An SAE is any untoward medical occurrence that results in death, is life-threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity, is a congenital anomaly/birth defect in the offspring of a study subject or is an abnormal pregnancy outcome. AESIs are predefined AEs of scientific and medical concern specific to the product or program, for which ongoing monitoring and rapid communication by the investigator to the sponsor can be appropriate, because such an event might warrant further investigation in order to characterise and understand it. Medically attended AEs are symptoms or illnesses requiring a hospitalisation, or an emergency room visit, or visit to/by a health care provider.

An SAE is any untoward medical occurrence that results in death, is life-threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity, is a congenital anomaly/birth defect in the offspring of a study subject or is an abnormal pregnancy outcome. AESIs are predefined (serious or non-serious) AEs of scientific and medical concern specific to the product or program, for which ongoing monitoring and rapid communication by the investigator to the sponsor can be appropriate, because such an event might warrant further investigation in order to characterise and understand it. Medically attended AEs are symptoms or illnesses requiring a hospitalisation, or an emergency room visit, or visit to/by a health care provider.

hSBA titers against all of N. meningitidis serogroup B test strains were calculated in terms of GMTs. Serogroup B strains tested were M14459 (factor H binding protein; fHbp), 96217 (Neisserial adhesin A; NadA), NZ98/254 (PorA), and M070241084 (Neisseria heparin binding antigen; NHBA). The serogroup B strains were grouped together to perform a pooled analysis. Adjusted means were obtained from ANCOVA model fitted to all of the Serogroup B test strains, study group, test strain and center as fixed effects; zero-centered pre-vaccination log-transformed titer was included as a continuous covariate.

hSBA titers against each of the N. meningitidis serogroup B test strains and N. meningitidis serogroups A, C, W-135, and Y were calculated in terms of GMTs. Serogroup B strains tested were M14459 (factor H binding protein; fHbp), 96217 (Neisserial adhesin A; NadA), NZ98/254 (PorA), and M070241084 (Neisseria heparin binding antigen; NHBA). Adjusted means were obtained from ANCOVA model fitted to each Serogroup (Strain) individually, study group and center as fixed effects and zero-centered pre-vaccination log-transformed titer as a continuous covariate.

Immune responses against N. meningitidis serogroup B test strains and N. meningitidis serogroups A, C, W-135, and Y, were calculated in terms of percentage of subjects with hSBA titers ≥ LLOQ. Serogroup B strains tested were M14459 (factor H binding protein; fHbp), 96217 (Neisserial adhesin A; NadA), NZ98/254 (PorA), and M070241084 (Neisseria heparin binding antigen; NHBA).

Immune responses against N. meningitidis serogroup B test strains and N. meningitidis serogroups A, C, W-135, and Y, were calculated in terms of percentage of subjects with a 4-fold increase in hSBA titers. A 4-fold rise was defined as: a) for individuals whose pre-vaccination titers were less than (\<) the limit of detection (LOD), the post-vaccination titers must have been ≥4-fold the LOD or ≥ the LLOQ, whichever was greater; b) for individuals whose pre-vaccination titers were ≥ the LOD and less than (\<) the LLOQ, the post-vaccination titers must have been at least 4 times the LLOQ; and c) for individuals whose pre-vaccination titers were ≥ the LLOQ, the post-vaccination titers must have been at least 4 times the pre-vaccination titer. Serogroup B strains tested were M14459 (factor H binding protein; fHbp), 96217 (Neisserial adhesin A; NadA), NZ98/254 (PorA), and M070241084 (Neisseria heparin binding antigen; NHBA).

hSBA mean ratios at 1 month after the last vaccination versus baseline were calculated in terms of GMRs i.e. as the anti-logarithm of the mean of the change from baseline of log-transformed titer values at 1 month after last vaccination and Baseline. Serogroup B strains tested were M14459 (factor H binding protein; fHbp), 96217 (Neisserial adhesin A; NadA), NZ98/254 (PorA), and M070241084 (Neisseria heparin binding antigen; NHBA). Adjusted means were obtained from ANCOVA model fitted to each Serogroup (Strain) individually, study group and center as fixed effects and zero-centered pre-vaccination log-transformed titer as a continuous covariate.