This study will assess the immunogenicity and safety of the GlaxoSmithKline (GSK) Biologicals' (formerly SmithKline Beecham Biologicals') combined DTPa-HBV-IPV/Hib (Infanrix hexa™) vaccine administered in the 3rd, 5th, 11th month of life. The last dose of DTPa-HBV-IPV/Hib will be given simultaneously with one dose of OPV vaccine.

Inclusion Criteria:

The inclusion criteria will be checked at study entry. If any of these criteria does not apply, the subject is not eligible for inclusion in the study.

• Healthy male and female subjects in the ≥12 and <16 weeks of life at the time of the first vaccination.
• Free of obvious health problems as established by medical history and clinical examination before entering into the study.
• Written informed consent obtained from the parents/guardians of the infant after they have been advised of the risks and benefits of the study in a language which they clearly understood, and before performance of any study procedure.

Exclusion Criteria:

The exclusion criteria will be checked at study entry and at each following visit. If any of these criteria applies at study entry, the subject is not eligible for inclusion in the study. If any of these criteria becomes applicable during the study, the subject should be withdrawn.

• Use of any investigational or non-registered 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.
• Administration of chronic immunosuppressants or other immune-modifying drugs within three months before vaccination).
• Administration of a vaccine not foreseen by the study within 30 days before each dose of the study vaccines and ending 30 days after.
• Previous vaccination against diphtheria, tetanus, pertussis, hepatitis B, polio and/or Hib disease.
• History of /or intercurrent diphtheria, tetanus, pertussis, hepatitis B, polio and/or Hib disease or infection.
• Any confirmed or suspected immunosuppressive or immunodeficient condition, including human immunodeficiency virus (HIV) infection.
• 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 seizures or of any neurological disease at study entry.
• Administration of immunoglobulins and/or any blood products since birth, or planned administration during the study period.
• Acute disease at the time of enrolment.

Patient-level data for this study will be made available through www.clinicalstudydatarequest.com following the timelines and process described on this site.