Study of PENTAXIM™ Vaccine Versus TETRAXIM™ Vaccine Given With ACTHIB™ Vaccine in South Korean Infants.

Inclusion Criteria: * Aged 2 months (56 to 70 days) inclusive on the day of inclusion * Born at full term of pregnancy (≥ 37 weeks) and with a birth weight ≥ 2.5 kg * Informed consent form signed by the parent(s) or other legal representative * Able to attend all scheduled visits and to comply with all trial procedures Exclusion Criteria: * Participation in another clinical trial in the 4 weeks preceding the trial inclusion * Planned participation in another clinical trial during the present trial period * Congenital or acquired immunodeficiency, immunosuppressive therapy such as long term systemic corticosteroids therapy * Systemic hypersensitivity to any of the vaccine components or history of a life threatening reaction to the trial vaccine or a vaccine containing the same substances * Chronic illness at a stage that could interfere with trial conduct or completion * Blood or blood derived products received in the past or current or planned administration during the trial (including immunoglobulins). * Any vaccination in the 3 weeks preceding the first trial vaccination. * History of diphtheria, tetanus, pertussis, poliomyelitis, Haemophilus influenzae type b infection (confirmed either clinically, serologically or microbiologically). * Clinical or known serological evidence of systemic illness including Hepatitis B, Hepatitis C and/or Human Immunodeficiency Virus (HIV) infection * Previous vaccination against the diphtheria, tetanus, pertussis, poliomyelitis diseases or Haemophilus influenzae type b infection with the trial vaccine or another vaccine. * Thrombocytopenia or a bleeding disorder contraindicating intramuscular vaccination * History of/current major neurological diseases or seizures. * Febrile illness (axillary temperature ≥ 38ºC) or acute illness on the day of inclusion. * Known family history of congenital or genetic immuno-deficiency.