In this extension study, V59P20E1, the sponsor was planning to assess 5-year antibody persistence in subjects who received one or two doses of MenACWY conjugate vaccine at 2 to 10 years of age, and to evaluate response to a booster dose administered 5 years after primary vaccination in the parent study V59P20 (NCT00616421).

Inclusion Criteria:

In order to participate in this study, all subjects must meet ALL of the inclusion criteria described.

1. Subject has (a) parent(s) or legal guardian(s) who has/have given written consent after the nature of the study has been explained according to local regulatory requirements.

2. If the subject is of an age where, according to local regulations, informed assent is required, that subject has provided assent to participate in the study.

3. Subject is in good health as determined by the outcome of medical history, physical examination, and clinical judgment of the investigator.

4. A negative urine pregnancy test is required before female subjects of childbearing potential will be enrolled. Of childbearing potential is defined as status post onset of menarche and not meeting any of the following conditions: menopausal for at least 2 years, status after bilateral tubal ligation for at least 1 year, status after bilateral oophorectomy, or status after hysterectomy.

5. For subjects who participated in study V59P20 (Groups MenACWYCRM_ 2 (≥7-≤10 Years), MenACWYCRM_1 (≥7-≤10 Years) and MenACWYCRM_ 1 (≥11-≤15 Years) only):

   • subject who enrolled in Groups MenACWYCRM_2 (≥7-≤10 Years), MenACWYCRM_1 (≥7-≤10 Years) and MenACWYCRM_1 (≥11-≤15 Years) of study V59P20, has completed this study and included in per protocol immunogenicity analysis;
   • the date of first vaccination in study V59P20 occurred 54 to 66 months prior to the collection of the blood sample at Visit 1.

6. For vaccine-naive subjects (Groups Vaccine Naive(≥7-≤10Years) and Vaccine Naive (≥11-≤15 Years) only):

   • Individual is a male or female 7 to 10 years of age (group Vaccine Naive(≥7-≤10Years)) or 11 to 15 years of age (Group Vaccine Naive (≥11-≤15 Years)).

Exclusion Criteria:

In order to participate in this study, all subjects must meet NONE of the exclusion criteria described.

1. If the subject is female of childbearing potential, sexually active, and has not used any of the acceptable contraceptive methods for at least 2 months prior to study entry and for the duration of the trial.
2. Subject is a pregnant or breast-feeding female.
3. Subjects' parents or legal guardians or subjects who are not able to comprehend and to follow all required study procedures for the whole period of the study.
4. History of documented or suspected invasive meningococcal disease.
5. Previous household contact with and/or intimate exposure to an individual with laboratory proven N. meningitidis infection within 60 days prior to enrollment and for the duration of the study.
6. Have received any other meningococcal vaccine since participation in V59P20 or, if vaccine-naive subjects, have not received any meningococcal vaccine since birth.
7. Suspected or known hypersensitivity reaction after a previous dose of Menveo, any component of this vaccine, including any other CRM197 and diphtheria toxoid.
8. Any contraindication or precaution against vaccination with Novartis Menveo™ vaccine as highlighted in the package insert.
9. Serious, chronic, or acute illnesses or diseases (i.e., cardiac, renal, neurologic, rheumatologic, metabolic, gastrointestinal, psychiatric, or other organ system).
10. Any confirmed or suspected condition with impaired/altered function of immune system (immunodeficient or autoimmune conditions).
11. Administration of any cancer chemotherapy, immune-modified or immunosuppressive agents or systemic corticosteroids for at least seven days at any dose in the past 12 weeks or planned use throughout the study period (nasal or inhaled steroids are permitted, as are steroids applied to the skin).
12. Administration of blood, blood products and/or plasma derivatives or any immunoglobulin preparation in the past 12 weeks or planned use throughout the study period.
13. Administration of any vaccine within 28 days prior to the study enrollment or planned administration during the study period.
14. Subjects participating in any clinical trial with another investigational product 28 days prior to first study visit or intent to participate in another clinical study at any time during the study period.
15. Subjects who have experienced a significant acute infection requiring systemic antibiotic treatment within the 5 days prior to enrolment or have experienced a body temperature ≥38°C (≥100.4°F) within the 3 days before the intended study vaccination.
16. Any condition which, in the opinion of the investigator, would pose a health risk to the participant.