Patterns of early transmission of pandemic influenza in London - link with deprivation.

Background: During the early containment phase in England from April to June 2009, the national strategy for H1N1 pandemic influenza involved case investigation and treatment, and tracing and prophylaxis of contacts.

Objective: To describe the relationship between early transmission of H1N1 pandemic influenza in London and age and socio-economic status.

Methods: Epidemiological data on cases of pandemic flu in London reported to the London Flu Response Centre were analysed to determine patterns of transmission.