Inclusion Criteria:

• Subjects for whom the investigator believes their parents/guardians can and will comply with the requirements of the protocol (e.g. completion of the diary cards, return for follow-up visits) should be enrolled in the study.
• Male or female between 12 and 15 months of age (e.g. from age 12 months until the day before age 16 months) at the time of vaccination.
• Written informed consent obtained from the parent/guardian of the subject.
• Healthy subjects as established by medical history and clinical examination before entering into the study.
• Have previously received three doses of 7-valent pneumococcal conjugate vaccine within the first year of life with the third dose administered at least 30 days prior to enrolment and vaccination with study vaccines.

Exclusion Criteria:

• 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.
• Concurrently participating in another clinical study, at any time during the study period, in which the subject has been or will be exposed to an investigational or a non-investigational product (pharmaceutical product or device).
• Chronic administration (defined as more than 14 days) of immunosuppressants or other immune-modifying drugs within six months prior to the first vaccine dose.
• Planned administration/ administration of a vaccine not foreseen by the study protocol from 30 days prior to vaccination until 42 days after vaccination, except for influenza vaccine and Hib vaccine.
• Previous vaccination against measles, mumps, rubella and/or varicella.
• Previous vaccination against hepatitis A or receipt of a fourth dose of pneumococcal conjugate vaccine.
• History of measles, mumps, rubella, varicella/zoster and hepatitis A diseases.
• Known exposure to measles, mumps, rubella and/or varicella/zoster within 30 days prior to the start of the study.
• Any confirmed or suspected immunosuppressive or immunodeficient condition, based on medical history and physical examination (no laboratory testing required), including human immunodeficiency virus (HIV) infection.
• A family history of congenital or hereditary immunodeficiency.
• History of allergic disease or reactions likely to be exacerbated by any component of the vaccines.
• Major congenital defects or serious chronic illness.
• History of any neurologic disorders or seizures, including febrile seizures.
• Acute disease at the time of enrolment.
• Administration of polyclonal immunoglobulins and/or any blood products during the six months before entering the study or planned administration during the study period.