GENEVA, April 29 (Reuters) - World Health Organization director-general Dr. Margaret Chan raised the pandemic threat awareness level to 5 out of 6 on Wednesday, meaning the world is at imminent risk of a pandemic from H1N1 swine flu.

"I have decided to raise the level of influenza pandemic alert from phase 4 to phase 5," Chan told a news briefing.

(Reporting by Maggie Fox, editing by Jackie Frank)

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