4月27日，在墨西哥报告有900人患猪流感可疑病例，世界卫生组织提出大流行警告6分量级的3- 4级。
On 27 April, with 900 cases of suspected swine flu reported in Mexico, the World Health Organization (WHO) upgrades the pandemic warning level from 3 to 4 on a six-point scale.
世卫组织警告，如禽流感病毒变为可容易地在人之间传播的种类，这些暴发和其它暴发可演变为全球性流感大流行。
WHO warns that these and other outbreaks could evolve into a global influenza pandemic if the avian influenza virus changes into a form which could transmit easily between people.
H5N 1目前仍是一种动物疾病，但世界卫生组织(WHO)已发出警告，H5N1是一种可能引发人类流感大流行的病毒。
H5N1 remains for the moment an animal disease, but the World Health Organization (WHO) has warned that H5N1 is a virus that has the potential to ignite a human influenza pandemic.
迄今为止，世卫组织已已让六级流行警告级别保持在5级不变，表明一场流感大流行迫在眉睫。
The WHO has so far left its six-level pandemic alert scale unchanged at phase five, signalling that a pandemic is "imminent."
但是即使是较温和的流感大流行也能引起严重的死亡警告。
流感大流行将要爆发的最重要的警告信号是什么？
What are the most important warning signals that a pandemic is about to start?
流感大流行将要爆发的最重要的警告信号是什么？
What are the most important warning signals that a pandemic is about to start?
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