Timeline: Tracking the Spread of Swine Flu

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. Timeline: The Spread of the Swine Flu Virus   Thursday, June 11, 2009 WHO alert level: 6 Watch ABC News' video from June 11 here. Read ABC News' story from June 11 here. The World Health Organization declares swine flu a pandemic and raises the alert to level 6. It's the first official...Full Story