Evaluate Safety & Immunogenicity of a Pandemic Influenza Vaccine (GSK1562902A) in Adults Over 60 Years of Age

The present study is designed to evaluate the immunogenicity and safety of a single or double dose of the pandemic influenza candidate vaccine (GSK1562902A), administered following a two-administration schedule (21 days apart) in adults over 60 years of age. The persistence of influenza antibodies will also be evaluated 24 months after vaccination.

The present study is designed to evaluate the immunogenicity and safety of a single or double dose of the candidate vaccine in healthy elderly persons. The candidate vaccine will be administered following a two-administration schedule (21 days apart) in adults over 60 years of age. The persistence of H5N1 influenza antibodies will also be evaluated up to two years after vaccination (neutralizing antibodies will only be evaluated in a subset of subjects in the adjuvanted groups). Single and double dose of H5N1 vaccine non-adjuvanted vaccine will be used as comparator.

Eligibility Criteria:
Inclusion Criteria:

* Subjects who the investigator believes that they can and will comply with the requirements of the protocol should be enrolled in the study.
* A male or female aged 61 years or above at the time of the first vaccination.
* Written informed consent obtained from the subject.
* Healthy subjects or subjects with well controlled underlying disease.

Exclusion Criteria:

* Administration of the licensed MF59-containing vaccines, e.g. Fluad™ or Addigrip™ or virosome-based influenza vaccines such as Inflexal V™, InfectoVac Flu™ or Invivac™ during the 2006-2007 influenza season.
* Administration of licensed vaccines within 2 weeks (for inactivated vaccines) or 4 weeks (for live vaccines) prior to enrolment in this study.
* Planned administration of a vaccine not foreseen by the study protocol up to 30 days after the second vaccination with H5N1 vaccine.
* 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 (no laboratory testing required).
* History of chronic alcohol consumption and/or drug abuse.
* History of hypersensitivity to vaccines.
* History of allergic disease or reactions likely to be exacerbated by any component of the vaccine (including egg and thiomersal allergy).
* 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.
* Serious chronic disease including any medically significant chronic pulmonary, cardiovascular, renal, neurological, psychiatric or metabolic disorder, as determined by medical history and physical examination.
* Administration of immunoglobulins and/or any blood products within the three months preceding the first vaccination or during the study.
* 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.
* Any condition which, in the opinion of the investigator, prevents the subject from participation in the study.