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Home Topics Infectious Diseases Infections A-Z Swine Influenza [Pandemic (H1N1) 2009 influenza]

Swine Influenza [Pandemic (H1N1) 2009 influenza]

Influenza A (H1N1) virus

Swine flu is a respiratory illness caused by a new strain of the flu A virus named 'Pandemic (H1N1) 2009' by the World Health Organization. Transmission is thought to occur in the same way as seasonal flu. The infection can be effectively treated with antivirals. Most reported cases in the UK have been mild and people have recovered fully after treatment but the infection can be severe in a small minority of cases.

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Key Messages

If you think you may have swine flu, contact NHS Direct, or phone your doctor:

You are advised to contact your doctor if you have serious underlying health conditions, are pregnant, or care for a child under one or children whose condition suddenly gets worse and those whose condition is still getting worse after 7 days (5 days for a child).