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.
在此早期阶段，这次流感大流行在全球的特征是严重程度为温和。
At this early stage, the pandemic can be characterized globally as being moderate in severity.
我们处于大流行的最早期阶段。
几种正处于开发阶段的实验性疫苗(包括大流行性流感疫苗和疟疾疫苗)也添加了角鲨烯，用于增强疫苗效力。
Squalene is being added to improve the efficacy of several experimental vaccines including pandemic flu and malaria vaccines which are being developed.
目前世卫组织的大流行预警级别仍然为第三阶段：人类感染新亚型病毒，但是这些感染中的绝大多数是直接从动物那里获得的。
The present WHO level of pandemic alert remains at phase 3: human infections with a new virus subtype are occurring, but the vast majority of these infections are acquired directly from animals.
第4阶段显示出显着增加风险大流行，但并不一定意味着大流行是一个放弃的结论。
Phase 4 indicates a significant increase in risk of a pandemic but does not necessarily mean that a pandemic is a forgone conclusion.
关于世卫组织大流行警戒级别目前在第5阶段，他说：“如果不改成6级，我将会非常吃惊！”
Regarding the WHO pandemic alert level, currently at Phase 5, he said: "I would be surprised if we don't get to a level 6."
到今年底，人类的H5N1病毒能力还不足以散播，警示层级只到第三阶段，距离真正的全球大流行（第六阶段）还差两步。
The self-limiting outbreaks of human H5N1 influenza seen so far bumped the alert level up to phase three, two steps removed from outright pandemic (phase six).
到今年底，人类的H5N1病毒能力还不足以散播，警示层级只到第三阶段，距离真正的全球大流行（第六阶段）还差两步。
The self-limiting outbreaks of human H5N1 influenza seen so far bumped the alert level up to phase three, two steps removed from outright pandemic (phase six).
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