Collaborative community studies of Swine Origin Influenza Virus (SOIV) H1N1

To provide timely information on The occurrence of ILI and of PCR confirmed influenza in different population subgroups. Clinical illness in symptomatic patients including range, duration and severity of symptoms and sensitivity and specificity of symptoms and fever. Access to care and treatment (experience of helplines, access to antivirals, treatment with antibiotics) Effectiveness of antivirals delivered through NHS Uptake and effectiveness of pandemic vaccine delivered through NHS Household secondary attack rates and serial interval. Population behaviour changes through the pandemic and during illness. To provide a representative control group for case control studies of severe disease. To provide a human DNA bank for future studies of genetic susceptibility. To provide a virus bank for studies of viral evolution as it transmits through households and different geographic areas.