猪流感大流行 swine influenza pandemic 流感大流行警告 influenza pandemic ; Flu epidemic ; Pandemic flu ; Influenza epicentre 后流感大流行时期 post-pandemic period ..
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猪流感大流行 swine influenza pandemic 流感大流行警告 influenza pandemic ; Flu epidemic ; Pandemic flu ; Influenza epicentre 后流感大流行时期 post-pandemic period ..
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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.
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