Updated July 10, 2009, 11:00 AM ET
Summary of Situation
Updated July 10, 2009, 11:00 AM ET
A Pandemic Is Declared
On June 11, 2009, the World Health Organization (WHO) signaled that a global pandemic of novel influenza A (H1N1) was underway by raising the worldwide pandemic alert level to Phase 6. This action was a reflection of the spread of the new H1N1 virus, [...]