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China’s Bird Flu Surge Is a Low Epidemic Threat, W.H.O. Says

Although there has been a surge in human infections with H7N9 avian flu in China this winter, the risk of an epidemic remains low, a World Health Organization official said on Wednesday.

But the virus — which has killed about a third of the people known to have caught it — has now split into two distinct strains.

That will probably force development of a second small stockpile of emergency vaccine to be rolled out if the virus becomes more transmissible and threatens to turn into

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