Study in Toddlers to Demonstrate Non-inferiority of GSK Biologicals' Hib-MenC & to Evaluate Persistence up to 5 Years.

Inclusion Criteria:

Primary phase:

• Subjects whom the investigator believes that their parents/guardians can and will comply with the requirements of the protocol.
• A male or female between, and including, 12 and 18 months of age at the time of vaccination.
• Written informed consent obtained from the parent or guardian of the subject.
• Free of obvious health problems as established by medical history and clinical examination before entering into the study.
• Previously completed routine childhood vaccinations to the best of his/her parents'/guardians knowledge.
• Having completed primary vaccination with two doses of Haemophilus influenzae type b outer membrane protein (Hib-OMP) containing vaccine OR three doses of diphtheria, tetanus, acellular pertussis and Haemophilus influenzae type b (DTPa/Hib) containing vaccine at least 6 months before the study start.

Long-term persistence phase:

- Having participated in the vaccination study 106445

Exclusion Criteria:

For the primary vaccination phase:

• Use of any investigational or non-registered product (drug or vaccine) other than the study vaccine(s) within 30 days preceding the first dose of study vaccine, or planned use during the study period.
• Chronic administration (defined as more than 14 days) or planned administration of immuno-suppressants or other immune-modifying drugs within six months prior to vaccination.
• Planned administration/administration of a vaccine not foreseen by the protocol during the period starting from 30 days before vaccination and ending 30 days after vaccination.
• Administration of a meningococcal vaccine not foreseen by the study protocol during the period starting at birth and ending at first dose.
• Previous administration of a booster dose of Hib vaccine.
• Previous vaccination against measles, mumps, rubella.
• History of H. influenzae type b, meningococcal serogroup C and/or confirmed measles, mumps or rubella diseases.
• Known exposure to measles, mumps or rubella within 30 days prior to the start of the study.
• Any confirmed or suspected immunosuppressive or immunodeficient condition, including human immunodeficiency virus infection.
• A family history of congenital or hereditary immunodeficiency.
• History of allergic disease or reactions likely to be exacerbated by any component of the vaccine.
• Major congenital defects or serious chronic illness.
• History of neurological disorders or more than one episode of febrile convulsion.
• Acute disease at the time of enrolment.
• Administration of immunoglobulins and/or any blood products since birth or planned administration during the study period.

Additional exclusion criteria for the long-term persistence phase: to be checked each year.

• Previous administration of a booster dose of Hib, meningococcal serogroup C vaccines.
• History of H. influenzae type b, meningococcal serogroup C diseases.