WHO declares H1N1 flu pandemic  

The H1N1 flu virus has officially become the world's first flu pandemic in more than 40 years.

Officials have stressed that a pandemic refers to geographical reach, not severity.

The World Health Organisation has raised the alert level from five to six after 30,000 people were diagnosed with the virus around the world.

Al Jazeera's Nazanine Moshiri reports on how the flu has spread.


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