填空题

If avian flu H5N1 gained the ability to move from person to person, it could cause a ______.

【参考答案】

pandemic或a global epidemic
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According to German scientists, a vaccine for avian flu H5N1 will be available in ______.
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One of the reasons why public health officials are concerned about avian flu is that it is deadly and can kill previously healthy ______.
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