To Evaluate Immunogenicity & Safety of GSK Bio's DTPa-HBV-IPV/Hib (Mixed Vaccine) and DTPa-IPV/Hib + HBV Vaccines

Inclusion Criteria:

• A male or female infant at the age of 11 - 17 weeks.
• Written informed consent obtained from the parents or guardians of the subject.
• Free of obvious health problems as established by clinical examination before entering into the study.
• Hepatitis B vaccine at birth and one month of age.

Exclusion Criteria:

• Previous vaccination against measles, mumps, rubella and/or varicella.
• Use of any investigational or non-registered drug or vaccine other than the study vaccines within 30 days preceding the first dose of study vaccine, or planned use during the study period.
• A family history of congenital or hereditary immunodeficiency.
• Any confirmed or suspected immunosuppressive or immunodeficient condition, including HIV infection.
• Major congenital defects.
• History of allergic disease or reactions likely to be exacerbated by any component of the vaccine.