Evaluation of Pandemic Vaccination Campaign

Inclusion Criteria: * Full legal competence; * Written informed consent obtained; * Assigned to use the services of Tampere health centre and community-dwelling; * At least 18 and no more than 75 years old, inclusive; * Belongs to the target group of A(H1N1)v vaccination in the region during the pandemic vaccination campaign; * Able to communicate fluently in Finnish or Swedish * Able to adhere to all protocol required study procedures without any special burden or risk, as judged by the investigator or designate. Exclusion Criteria: * For the total study cohort, no specific exclusion criteria will be applied; * For the subgroup for follow-up of immunogenicity of the vaccine (immunogenicity cohort), exclusion criteria comprise: * previous severe allergic reaction to influenza vaccines or known severe allergy to the ingredients of the vaccine * previous severe allergic reaction to eggs * significant immunological disorder