The purpose of the study is to evaluate the immunogenicity, safety and reactogenicity of a booster dose of DTPw-HBV/Hib-MenAC compared to DTPw-HBV/Hib given to healthy subjects at 15 to 24 months of age primed with 3 doses of Tritanrix-HepB/Hib-MenAC in study 100480. Antibody persistence will be evaluated at 24 to 30 months. Immunogenicity, safety and reactogenicity of a dose of Mencevax ACWY given at 24 to 30 months will also be evaluated when given to subjects not boosted with a MenA conjugate and/or MenC containing vaccine.
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Percentage of Subjects With Meningococcal C Serum Bactericidal Assay (SBA-MenC) Antibody Titers Above the Cut-off Value
Timeframe: One month Post-Booster vaccination at 15-24 months of age
Percentage of Subjects With SBA-MenA Antibody Titers Above the Cut-off Value
Timeframe: One Month Post-Booster vaccination at 15-24 months of age
Percentage of Seroprotected (SPR) Subjects With Anti-Polyribosyl Ribitol Phosphate Anti-(PRP) Antibody Concentrations Above the Cut-off Value
Timeframe: One Month Post-Booster vaccination at 15-24 months of age