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The H7N9 viruses that emerged in China in 2013 were nonpathogenic in chickens but mutated to a highly pathogenic form in early 2017 and caused severe disease outbreaks in chickens. The H7N9 influenza viruses have caused five waves of human infection, with almost half of the total number of human cases (766 of 1,567) being reported in the fifth wave, raising concerns that even more human infections...
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