The purpose of this study is to evaluate the safety, reactogenicity and immunogenicity of a booster dose of the candidate Hib-MenC conjugate vaccine given concomitantly with measles, mumps and rubella (MMR) vaccine, versus Hib-MenC only and MMR only, when given to healthy subjects aged 13 to 14 months who were primed with 3 doses of Hib (as part of a DTPa -containing vaccine) and MenC-CRM197.

This multicenter study is open with respect to the treatment allocation, but double-blind with respect to the Hib-MenC-TT lots (3 lots). Hib-MenC-TT and Priorix™, when given separately, serve as active controls. Two blood samples are taken: before and one month after vaccination. Additional vaccines are offered at study end in order to complete the vaccine schedule recommended in Spain

Inclusion criteria:

• Healthy male or female between, and including, 13 and 14 months of age.
• Previously completed 3-dose primary vaccination with a MenC-CRM197 vaccine, and Hib (given as part of a combined DTPa-containing vaccine) with at least 6 months between the administration of the third doses and the study entry.

Exclusion criteria:

• Use of any investigational or non-registered product (drug or vaccine) other than the study vaccine(s) within 30 days preceding the study vaccine, or planned use during the study period.
• Previous vaccination against OR history of H. influenzae type b (Hib) and/or meningococcal serogroup C disease and/or measles, mumps or rubella OR known exposure to measles, mumps or rubella within 30 days prior to the start of the present study.
• 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.
• History of allergic disease or reactions likely to be exacerbated by any component of the vaccine including neomycine

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