Immunogenicity and Safety Study of Booster Dose of GSK Biologicals' IPV (Poliorix™) and DTPa/Hib (Infanrix+Hib™) Vaccine

Inclusion Criteria:

• A male or female child between, and including, 18 and 24 months of age at the time of the booster vaccination.
• Subjects who completed the full three-dose primary vaccination course in study NCT01086423.
• Subjects who the investigator believes that their parent(s)/ Legally Acceptable Representative(s) LAR(s) can and will comply with the requirements of the protocol
• Written informed consent obtained from the parent(s)/LAR(s) of the subject.
• Healthy subjects as established by medical history and clinical examination before entering into the study.

Exclusion Criteria:

• Child in care
• Use of any investigational or non-registered product other than the study vaccine(s) within 30 days preceding the booster dose of the study vaccine, or planned use during the study period.
• Chronic administration of immunosuppressants or other immune-modifying drugs within six months prior to the booster dose.
• Administration of a vaccine not foreseen by the study protocol within 30 days prior to the booster vaccination, or planned administration during the study period.
• Participation in another clinical study within three months prior to enrolment in the present booster study or at any time during the present booster study, in which the subject has been or will be exposed to an investigational or a non-investigational product.
• Evidence of previous diphtheria, tetanus, pertussis, poliomyelitis and Haemophilus influenzae type b, vaccination or disease since the conclusion visit of primary study NCT01086423.
• Serious chronic illness.
• Administration of immunoglobulins and/or any blood products within the 90 days preceding the booster dose of study vaccine or planned administration during the study period.
• Occurrence of any of the following adverse events after a previous administration of a DTP vaccine.
• Encephalopathy
• Temperature of ≥ 40.0°C (axillary temperature) within 48 hours of vaccination, not due to another identifiable cause.
• Collapse or shock-like state within 48 hours of vaccination.
• Persistent, inconsolable crying occurring within 48 hours of vaccination and lasting ≥ 3 hours.
• Seizures with or without fever occurring within 3 days of vaccination.

The following condition is temporary or self-limiting, and a subject may be vaccinated once the condition has resolved if no other exclusion criteria is met:

• Acute disease and/or fever at the time of enrolment.