WHO declares H1N1 official flu pandemic - 11 Jun 09

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The H1N1 flu virus has officially become the world's first flu pandemic in more than 40 years, but doctors say there is no need to panic. Officials stress 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 cases have been diagnosed around the world.

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