A Dose-ranging Pediatric Study of an Adjuvanted Pandemic Influenza Vaccine

Inclusion Criteria: 1. Healthy male and female subjects of 6 months through \<9 years of age on the day of informed consent/assent. 2. Documented consent provided by the subject's parent(s)/LAR(s) have voluntarily given written informed consent/assent after the nature of the study has been explained according to local regulatory requirements, prior to study entry. 3. Subject's parent(s)/LAR(s) able to comprehend and comply with all study procedures, and available for all clinic visits and telephone contacts scheduled in the study. 4. Subjects must provide a baseline blood sample within 10 days prior to the Day 1 vaccination. Exclusion Criteria: Each subject must not have: 1. Progressive, unstable or uncontrolled clinical conditions. 2. Hypersensitivity, including allergy, to any component of vaccines, medicinal products or medical equipment whose use is foreseen in this study. 3. Clinical conditions representing a contraindication to intramuscular vaccination and blood draws, ie, 1. Subjects who have had a fever (body temperature measurement ≥ 38°C) within three days prior to vaccination. The subject may return for vaccination after they have been free of fever for three days. 2. History of epilepsy or convulsions (excluding febrile convulsions). 3. A subject who has any medical condition meeting the definition of AESI defined for the purposes of this trial (see appendix A). 4. Subjects who have received antipyretic medication within the past 24 hours prior to vaccination. The subject may return for vaccination after a period of 24 hours has passed since the administration of an antipyretic. 4. Abnormal function of the immune system resulting from: 1. Clinical conditions. 2. Systemic administration of corticosteroids (PO/IV/IM) for more than 14 consecutive days within 90 days prior to informed consent/assent. Topical, inhaled and intranasal corticosteroids are permitted. Intermittent use (one dose in 30 days) of intra-articular corticosteroids are also permitted. 3. Administration of antineoplastic and immunomodulating agents or radiotherapy from within 90 days prior to informed consent/assent. 5. Suspicion of pandemic influenza illness within past six months or have ever received previous pandemic H5N1 flu vaccination. 6. Received immunoglobulins or any blood products within 180 days prior to informed consent/assent. 7. Received an investigational or non-registered medicinal within 30 days prior to informed consent/assent. 8. Children of study site staff (this includes research or clinic staff) or children who are otherwise related to study site staff or have household members who are study site staff. Study site staff are employees with direct or indirect contact with study subjects and/or have access to any study documents containing subject information. This would include receptionists, persons scheduling appointments or making screening calls, regulatory specialists, laboratory technicians, medical assistants, document scanners, etc. study personnel as an immediate family or household member. 9. Any other clinical condition that, in the opinion of the investigator, might interfere with the results of the study or pose additional risk to the subject due to participation in the study. 10. Individuals who received any other vaccines within 14 days (for inactivated vaccines) or 28 days (for live vaccines) prior to enrolment in this study or who are planning to receive any vaccine prior to day 43. Following day 43 other vaccines may be administered, including seasonal flu.