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Associated Press
FILE - In this April 3, 2013 file photo, chickens are seen at a chicken farm on the outskirts of Shanghai, China. Chinese scientists have for the first time found strong evidence of how humans got infected with a new strain of bird flu: from chickens at a live market. The research was published online Thursday April 25, 2013 in the journal Lancet. (AP Photo/Gillian Wong, File)

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