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WHO Pandemic Declaration

This website is archived for historical purposes and is no longer being maintained or updated. For updated information on the 2011-2012 flu season, see the CDC Seasonal Flu website.

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, not the severity of illness caused by the virus. At the time, more than 70 countries had reported cases of novel influenza A (H1N1) infection and there were ongoing community level outbreaks of novel H1N1 in multiple parts of the world.

 

 

 

 

 

 

 

 

 

 
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