Study on the Incidence of Influenza and Its Complications, in Subjects Aged 50 Years and Over Vaccinated With Fluarix™

Inclusion Criteria:

- A male or female age 50 years or older at the time of the first vaccination.

- non-childbearing female

- Availability to follow up by phone

- Subjects with residence status allowing free mixing with general community

Exclusion Criteria:

- Use of non-registered products

- Pregnancy

- Hypersensitivity to a previous dose of influenza vaccine

- Acute disease at the time of enrolment/vaccination.

- History of allergy or reactions likely to be exacerbated by any component of the
vaccine

- Any contra-indication to intramuscular administration of Fluarix™

- For subjects enrolled in the immunogenicity subset only: administration of
immune-modifying drugs within 7 days prior to the vaccination