The purpose of this study is to evaluate the immunogenicity, safety and reactogenicity of a booster dose of the Hib-MenC conjugate vaccine when given to healthy subjects aged 13 to 14 months who were primed with three doses of Hib-MenC compared to a booster dose of Infanrix hexa given to subjects primed with three doses of Infanrix hexa and Meningitec.

The study is open and Infanrix hexa will serve as active control. Subjects will receive one vaccine dose of either Hib-MenC or Infanrix hexa, and will have 2 blood samples taken: before and one month after vaccination. Subjects who will receive a booster dose of Hib-MenC were primed with 3 doses of Infanrix penta + Hib-MenC or 2 doses of NeisVac-C and Infanrix hexa / Infanrix IPV/Hib.

Inclusion criteria:

• Healthy male or female between, and including, 13 and 14 months of age
• Having participated in the primary vaccination study 217744/097.

Exclusion criteria:

• Previous vaccination against OR history of OR known exposure to diphtheria, tetanus, pertussis, hepatitis B, polio, H. influenzae type b (Hib) and/or meningococcal serogroup C disease except if within the framework of study 217744/097
• Any confirmed or suspected immunosuppressive or immunodeficient condition, including human immunodeficiency virus (HIV) infection
• A family history of congenital or hereditary immunodeficiency
• History of any neurologic disorders or seizures

Patient-level data for this study will be made available through www.clinicalstudydatarequest.com following the timelines and process described on this site.