The purpose of this study is to evaluate the immunogenicity, safety and reactogenicity of 3 doses of the meningococcal serogroup B vaccine when given, using either a 0-2-4 month or a 0-1-6 month schedule, to healthy adolescents aged 12-18 years; a control group will receive 2 doses of Havrix™ (0-6 months) and Meningitec™ (month 1).