The WHO was convening an expert panel to consider whether to raise the pandemic alert level or issue travel advisories.

世卫组织正在召开一个专家小组，以考虑是否提高流行病警戒级别或问题旅行忠告。

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The World Health Organization has raised its pandemic alert level for the deadly swine flu virus, signaling that the infection is spreading among humans in community-level outbreaks.

世界卫生组织提高致命猪流感病毒的疫情警戒级别，显示这种病毒正在社区中人与人之间扩散。

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Their occurrence does not call for any change in the present level of pandemic alert.

这些病例的发生并不要求在目前的大流行预警级别方面作任何改变。

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The World Health Organization says it needs to see clear evidence of sustained community transmission of the swine flu virus from person-to-person in at least two regions of the world before it raises its alert to the phase six pandemic level.

VOA: standard.2009.05.14

The World Health Organization on Monday raised its pandemic alert level in response to the outbreak of swine flu that originated in Mexico.

CNN: The story