Timeline: Tracking the Spread of Swine Flu

A summary of the major developments in the H1N1 outbreak.

ByABC News

April 30, 2009, 9:33 AM

June 11, 2009 -- Below is a timeline of the events in the rapidly changing flu outbreak. For answers to frequently asked questions and information on the latest developments, visit ABC News' On Call Swine Flu Center.

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Mar 24, 9:35 PM

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