Consistency Study of GlaxoSmithKline (GSK) Biologicals' MMR Vaccine (209762) (Priorix) Comparing Immunogenicity and Safety to Merck & Co., Inc.'s MMR Vaccine (M-M-R II), in Children 12 to 15 Months of Age

Child in care.

Use of any investigational or non-registered product other than the study vaccine(s) during the period starting 30 days before the day of study vaccination (i.e., 30 days prior to Day 0) or planned use during the entire study period.

Concurrently participating in another clinical study, in which the child has been or will be exposed to an investigational or a non-investigational product.

Chronic administration of immunosuppressants, or other immune-modifying drugs during the period starting 180 days prior to the first vaccine dose or any planned administration of immunosuppressive and immune-modifying drugs during the entire study.

* For corticosteroids, this will mean prednisone, ≥0.5 mg/kg/day or equivalent.

* Inhaled and topical steroids are allowed.

Planned administration/ administration of a vaccine not foreseen by the study protocol during the period starting 30 days prior to study vaccination at Visit 1 and ending at Visit 2. Please Note:

* Inactivated influenza (Flu) vaccine and Haemophilus influenzae type b conjugate vaccine (Hib) vaccines may be given at any time, including the day of study vaccination (Flu and Hib vaccines must be administered at a different location than the study vaccine/s).

* Any other age appropriate vaccine may be given starting at Visit 2 and anytime thereafter.

Administration of immunoglobulins and/or any blood products during the period starting 180 days prior to study vaccination at Visit 1 or planned administration from the date of vaccination through the immunogenicity evaluation at Visit 2.

History of measles, mumps, rubella, varicella/zoster and/or hepatitis A disease.

Known exposure to measles, mumps, rubella and/or varicella/zoster during the period starting within 30 days prior to first study vaccination.

Previous vaccination against measles, mumps, rubella, hepatitis A and/or varicella virus.

Any confirmed or suspected immunosuppressive or immunodeficient condition, based on medical history and physical examination.

A family history of congenital or hereditary immunodeficiency.

History of allergic disease or reactions likely to be exacerbated by any component of the vaccines, including hypersensitivity to neomycin, latex or gelatin.

Blood dyscrasias, leukemia, lymphomas of any type, or other malignant neoplasms affecting the bone marrow or lymphatic systems.

Acute disease at the time of enrollment. All vaccines can be administered to persons with a minor illness such as diarrhea, mild upper respiratory infection without fever.

Active untreated tuberculosis based on medical history.

Any other condition which, in the opinion of the investigator, prevents the child from participating in the study.

For US children only:

Child that previously received a vaccination with heptavalent Prevnar/Prevenar (prior vaccination should be with 3 doses of Prevnar 13 only).

Child that previously received a fourth dose of any pneumococcal conjugate vaccine.

What this study is about