An Observational Study to Investigate the Incidence of Influenza, Downstream Complications of Influenza and Hospitalizations, in Elderly Subjects Vaccinated With GSK Biologicals' Influenza Vaccine (Fluarix™) Administered Intramuscularly.

This study will investigate the incidence of influenza, disease and various possible downstream complications and hospitalizations or emergency room visits after routine annual vaccination of the elderly population with Fluarix™.