Influenza Vaccine Revaccination in Ambulatory Elderly Subjects

Inclusion Criteria : * Aged ≥ 65 years on the day of vaccination * Enrolled in and completed study FID29 and received the correct vaccine for the group to which they were randomized * Informed consent form signed and dated * Able to attend all scheduled visits and to comply with all trial procedures * Subject is medically stable. Exclusion Criteria : * Known systemic hypersensitivity to any of the vaccine components or history of a life-threatening reaction to the trial vaccine or to a vaccine containing any of the same substances * Participation in another clinical trial investigating a vaccine, drug, medical device, or a medical procedure in the four weeks preceding the trial vaccination * Planned participation in another clinical trial during the present trial period * Known or suspected congenital or acquired immunodeficiency, immunosuppressive therapy such as anti-cancer chemotherapy or radiation therapy within the preceding 6 months, or long-term systemic corticosteroids therapy * Chronic illness, at a stage that could interfere with trial conduct or completion, in the opinion of the investigator * Current alcohol abuse or drug addiction that may interfere with the subject's ability to comply with trial procedures * Receipt of blood or blood-derived products in the past 3 months, that might interfere with the assessment of immune response * Receipt of any vaccination in the 4 weeks preceding the trial vaccination * Planned receipt of any vaccine in the 4 weeks following the trial vaccination * Known human immunodeficiency virus (HIV), hepatitis B (HBs) antigen, or Hepatitis C seropositivity. * Previous vaccination against influenza in the past 6 months with the trial vaccine or another vaccine * Thrombocytopenia, bleeding disorder or anticoagulants in the 3 weeks preceding inclusion contraindicating intramuscular (IM) vaccination * Subject deprived of freedom by an administrative or court order, or in an emergency setting, or hospitalized without his/her consent * Neoplastic disease or any hematologic malignancy, (except localized skin or prostate cancer that is stable at the time of vaccination in the absence of therapy, as well as subjects who have a history of neoplastic disease and who have been disease free for ≥ 5 years). * Personal or family history of Guillain-Barré Syndrome.