第6级，大流行阶段，其特点是除了第5级确定的标准外，在世卫组织一不同区域至少其他一个国家发生了社区层面的暴发。
Phase 6, the pandemic phase, is characterized by community level outbreaks in at least one other country in a different WHO region in addition to the criteria defined in phase 5.
世卫组织在1999年采用了大流行预警的分阶段方法。
The phased approach to pandemic alert was introduced by WHO in 1999.
在这方面，宣布大流行的分阶段方法有些死板和局限。
In this regard, the phased approach to the declaration of a pandemic was rigid and confining.
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