Meningococcal InfectionsMeningitis, MeningococcalNeisseria meningitidisMeningococcal VaccinesSulfadiazineNeisseria meningitidis, Serogroup W-135Complement C7Neisseria meningitidis, Serogroup CPurpuraComplement C8ProperdinBacterial VaccinesSerotypingBlood Bactericidal ActivityPenicillin GPolysaccharides, BacterialAntibodies, BacterialNeisseria meningitidis, Serogroup BVaccinationSepsisNeisseria meningitidis, Serogroup AVaccines, ConjugatePopulation SurveillanceNeisseria lactamicaNeisseria meningitidis, Serogroup YSensitivity and SpecificityCarrier StateRetrospective StudiesPorinsBacterial Outer Membrane Proteins