Safety, Reactogenicity & Immunogenicity Study to Evaluate a Booster Dose of GSK Biologicals' Hib-MenC Given With Priorix™ in Toddlers (13-14 m) Primed With 3 Doses of Hib and MenC-CRM197

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