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Timeline: Swine flu

This timeline, published by Nature, lists key dates and events in the 2009 outbreak of A(H1N1) influenza, or 'swine flu'. Drawing on information from the WHO, the US Centers for Disease Control and Prevention and others, it details confirmed and reported cases of A(H1N1), highlights the geographical spread of the virus and links to official documentation and key research findings as they are released.

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