An Efficacy Study of GlaxoSmithKline (GSK) Biologicals' Candidate Influenza Vaccine GSK2321138A in Children

Inclusion Criteria:

• Subjects who the investigator believes that their parents/Legally Acceptable Representative (LARs) can and will comply with the requirements of the protocol.
• A male or female between, and including, 6 and 35 months of age at the time of first vaccination; children are eligible regardless of history of influenza vaccination.
• Written informed consent obtained from the parent(s) /LAR(s) of the subject.
• Subjects in stable health as determined 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 vaccines within 30 days preceding the first dose of study vaccine, or planned use during the study period.
• Prior receipt of any influenza vaccine within 6 months preceding the first dose of study vaccine, or planned use of such vaccines during the study period.
• Children with underlying illness who are at risk of complications of influenza and for whom yearly (seasonal) influenza vaccination is recommended in their respective country.
• Any confirmed or suspected immunosuppressive or immunodeficient condition (including HIV), based on medical history and physical examination.
• Chronic administration of immunosuppressants or other immune modifying drugs within six months prior to the first vaccine dose. Inhaled and topical steroids are allowed.
• Administration of immunoglobulins and/ or any blood products within 3 months preceding the first dose of study vaccine or planned administration during the study period.
• Any known or suspected allergy to any constituent of influenza vaccines, non-influenza vaccine comparators and latex; a history of anaphylactic-type reaction to consumption of eggs; or a history of severe adverse reaction to a previous vaccination.
• Any contraindication to intramuscular injection.
• Acute disease and/or fever at the time of enrolment.
• Any other condition which, in the opinion of the Investigator, prevents the subject from participating in the study.

• Additional criteria for children ≥ 12 months of age:

  • Prior receipt of any licensed varicella vaccine* or any licensed hepatitis A vaccine or planned use of these vaccines during the study period. Other routine registered childhood vaccinations are permitted.

    * For countries with varicella vaccine administered as 2-dose schedule, prior receipt of a single dose of a varicella vaccine is allowed if administered at least 2 weeks before the first study vaccination.

  • Any history of hepatitis A or varicella diseases.

• Additional criteria for children 6 - 11 months of age in countries without universal mass vaccination recommendation for pneumococcal vaccine:

  • Prior receipt of any pneumococcal conjugated vaccine or planned use of this vaccine during the study period. Other routine registered childhood vaccinations are permitted.