GENEVA, May 19 (Reuters) - The world remains under threat from the new H1N1 influenza strain, even if the effect so far has been fairly mild, U.N. Secretary-General Ban Ki-moon said on Tuesday.

"We must remain vigilant. We may be in a grace period with H1N1 but we are still in the danger zone," Ban told a news conference during the World Health Organisation's annual congress. (Reporting by Laura MacInnis and Katie Reid)

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