Study of the Safety and Immune Response of a Meningococcal Vaccine Administered to Healthy Children

Inclusion Criteria: * Group 1: Healthy children 2-10 years of age; * Group 2: Healthy toddlers 12-23 months of age; who are up to date with age appropriate immunizations for diphtheria, tetanus, pertussis, polio, hepatitis B, Hemophilus influenzae type b, and pneumococcus. Exclusion Criteria: * Group 1: Subjects with a previous or suspected disease caused by N. meningitidis; or previous immunization with a meningococcal vaccine or vaccine containing meningococcal antigen(s); Any serious acute, chronic or progressive disease. * Group 2: Subjects with a previous or suspected disease caused by N. meningitidis or previous immunization with a meningococcal vaccine or vaccine containing meningococcal antigen(s); Any serious acute, chronic or progressive disease.