The H5N1 strain of avian flu isn't new. It was discovered in China in 1996. But in recent years it's started passing from mammal to mammal. How much should humans worry? Show more
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The H5N1 strain of avian flu isn't new. It was discovered in China in 1996. But in recent years it's started passing from mammal to mammal. How much should humans worry? Show more
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