Study to Evaluate Reactogenicity and Immunogenicity of Revaccination With Adjuvanted Influenza Vaccine in Elderly Adults

Inclusion Criteria: * The subjects must be healthy adults ages 18-40 years or \>/= 65 years previously vaccinated with either Fluarix or the adjuvanted vaccine. Exclusion Criteria: * Subjects will be excluded if they take/have taken chronically high doses of immunosuppressants or other immune modifying drugs within six months before vaccination, or immunoglobulins or blood products within three months before vaccination, or any investigational product within 30 days before vaccination * Have a history of influenza infection since previous vaccination * Women who are pregnant * Subjects who have an acute or chronic clinically significant disease or an immunosuppressive/deficient condition, or have contra-indications to influenza vaccination