One Year Antibody Persistence After a Fourth Dose Boost or Two Catch-Up Doses of Novartis Meningococcal B Recombinant Vaccine Administered Starting From 12 Months of Age and Response to a Third Dose Boost or Two Catch-Up Doses Starting at 24 Months of Age

Inclusion Criteria:

• Healthy male and female children, 23 to 27 months of age (naïve children)
• Available for all the visits scheduled in the study;
• For whom parent(s)/legal guardian(s) have given written informed consent according to local regulations after the nature of the study has been explained;
• Available for all the visits scheduled in the study;
• In good health as determined by medical history, physical examination, clinical judgment of the investigator.
• Healthy children who participated in the immunogenicity part of V72P13E1 and have received their last vaccination 12 months (-30/+60 days) before enrolment in V72P13E2;
• Who received all vaccinations with rMenB+OMV NZ in V72P13 and V72P13E1 according to the protocols;
• Who provided at least the blood sample one month after their fourth dose of rMenB+OMV NZ (groups B246_12M12/B246_12M13) or after their second dose of rMenB+OMV NZ (groups B13_15_27/B12_14_26) in V72P13E1 according to the protocol;
• For whom parent(s)/legal guardian(s) had given written informed consent after the nature of the study has been explained;
• In good health as determined by medical history, physical examination, clinical judgment of the investigator.

Exclusion Criteria:

• Subjects whose parent(s)/legal guardian(s) were unwilling or unable to give written informed consent to participate in the study;
• History of any meningococcal B vaccine administration;
• Previous ascertained or suspected disease caused by N. meningitidis;
• For whom parent(s)/legal guardian(s) have given written informed consent according to local regulations after the nature of the study has been explained;
• History of severe allergic reaction after previous vaccinations or hypersensitivity to any vaccine component;
• Antibiotics treatment within 6 days prior to enrolment;
• Household contact with and/or intimate exposure to an individual with laboratory confirmed N. meningitidis;
• Any serious chronic or progressive disease
• Known or suspected impairment/ alteration of the immune system,
• Receipt of, or intent to immunize with another vaccine, within 30 days prior and after vaccination with the investigational vaccines (within 14 days for licensed flu vaccines)
• Significant acute or chronic infection within the previous 7 days or axillary temperature ≥38C within the previous day;
• Family members and household members of research staff;
• Any serious chronic or progressive disease according to the judgment of the investigator (e.g., neoplasm, diabetes mellitus Type I, cardiac disease, hepatic disease, neurological disease or seizure, either associated with fever or as part of an underlying neurological disorder or syndrome, autoimmune disease, Human Immunodeficiency Virus (HIV) infection or Acquired Immune Deficiency Syndrome (AIDS), or blood dyscrasias or diathesis, signs of cardiac or renal failure or severe malnutrition);
• Known or suspected impairment/alteration of the immune system, immunosuppressive therapy, use of systemic corticosteroids or chronic use of inhaled high-potency corticosteroids within 30 days prior to enrolment (use of low or moderate doses of inhaled steroids is not an exclusion);
• Receipt of blood, blood products and/or plasma derivatives or any parenteral immunoglobulin preparation within 90 days prior to enrolment;
• Participation in another clinical trial within 90 days prior to enrolment or planned for during study;
• Receipt of, or intent to immunize with any other vaccine(s) within 30 days prior to enrolment (exception: flu-vaccines should not be administered within 14 days prior to enrolment);
• Any condition which, in the opinion of the investigator, might interfere with the evaluation of the study objectives.