发生在美国南部和墨西哥及欧洲部分国家的人感染猪流感病毒（swine influenza）A(H1N1)疫情已经引起全球的广泛关注，世界卫生组织29日晚在日内瓦宣布，将全球流感大流行警告级别从目前的4级提高到5级。
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全球有1500人感染猪流感病毒，30人因其死亡，这些人几乎都在墨西哥。
Swine flu has infected 1,500 people worldwide and killed around 30, almost all in Mexico.
全球有1500人感染猪流感病毒，30人因其死亡，这些人几乎都在墨西哥。
Swine flu has infected 1, 500 people worldwide and killed around 30, almost all in Mexico.
几个月以来，年轻人感染猪流感病毒的病例要多于老年人，这个不寻常的情况说明老年人很可能在过去感染过这种病毒。
For months, it has been apparent that swine flu strikes the young more often than the old - an unusual pattern that suggests older patients could have been exposed to similar viruses in the past.
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