Study to Evaluate the Safety and Immunogenicity of a Pandemic Influenza Vaccine in Adults Aged Between 18 and 60 Years

Inclusion criteria: * A male or female between, and including, 18 and 60 years of age at the time of the first vaccination. * Healthy subjects as established by medical history and clinical examination before entering into the study. * If the subject is female, she must be of non-childbearing potential. Exclusion criteria: * Administration of any vaccine during the period starting 15 days before the first administration of the study vaccine and ending 21 after the second one. * Administration of an influenza vaccine other than the study vaccines during the entire study period. * Chronic administration (defined as more than 14 days) of immunosuppressants or other immune-modifying drugs within six months prior to the first administration of the study vaccine. * Any confirmed or suspected immunosuppressive or immunodeficient condition, based on medical history and physical examination * History of hypersensitivity to vaccines. * History of allergic disease or reactions likely to be exacerbated by any component of the vaccine. * Acute clinically significant pulmonary, cardiovascular, hepatic or renal functional abnormality, as determined by physical examination or laboratory screening tests. * Acute disease at the time of enrolment. * Administration of immunoglobulins and/or any blood products within the three months preceding the first administration of the study vaccine or during the study. * lactating women * Use of any investigational or non-registered product (drug or vaccine) other than the study vaccine(s) within 30 days prior to the first vaccination, or planned use during the study period.