Dose Ranging Study to Evaluate Immunogenicity and Safety of Adjuvanted or Non-adjuvanted Cell Culture-derived H5N1 Influenza Vaccine in Young Adults (18-40 Years Old)

Inclusion Criteria:

- Healthy subjects aged 18-40 years, mentally competent, who have signed an informed
consent form after having received a detailed explanation of the study protocol;

- Able to understand and comply with all study procedures and to complete study diaries,
to be contacted, and to be available for study visits.

Exclusion Criteria:

- Receipt of another investigational agent within 4 weeks prior to enrollment or before
completion of the safety follow-up period in this or in another study; unwilling to
refuse participation in another clinical study through the end of this study;

- Receipt of an H5N1 vaccine;

- Receipt of another vaccine within 3 weeks prior to Visit 1 or planned vaccination
before Visit 5, or within 3 weeks prior to Visit 7 or before Visit 9;

- Influenza vaccination for the current season within 2 months prior to enrollment
(seasonal influenza vaccination is allowed after Visit 5, but no later than 2 months
before the booster dose);

- Experience of any acute disease or infection requiring systemic antibiotic or
antiviral therapy (chronic antibiotic therapy for urinary tract prophylaxis is
acceptable) within 7 days prior to enrollment and prior to the booster dose or fever
within 3 days prior to Visit 1 and Visit 7;

- Pregnant or breastfeeding, or females of childbearing potential who refuse to use an
acceptable method of birth control during the study period for at least 6 weeks
following the booster dose; and, if sexually active, who have not used a reliable
birth control method for at least two months prior to study entry;

- Any serious disease, such as: cancer; autoimmune disease; diabetes mellitus type I;
diabetes mellitus type II; diabetes relating to genetic defects/syndromes, diseases of
the exocrine pancreas or infections; advanced arteriosclerotic disease; moderate or
severe chronic obstructive pulmonary disease (COPD); asthma that is greater than mild
in severity and/or has exacerbations more than 2 days per week; acute or progressive
hepatic disease; acute or progressive renal disease; hyperthyroidism; medically
significant bleeding disorders; history of neurological disorders;

- Body mass index (BMI) ≥ 35 kg/m2 where BMI is for obese and not for high muscle mass;

- History of (or current) drug or alcohol abuse, surgery planned during the study period
or any other condition that in the investigator's opinion would interfere with safety
of the subject or the evaluation of study objectives or the visit schedule;

- Hypersensitivity to any component of the study vaccine;

- Known or suspected impairment/alteration of immune function;

- Members of the research staff or their relatives.