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In this Wednesday, Dec. 31, 2014, file photo, health workers in full protective gear collect dead chickens killed by using carbon dioxide, after bird flu was found in some birds at a wholesale poultry market in Hong Kong. (AP Photo/Kin Cheung, file)

In this Wednesday, Dec. 31, 2014, file photo, health workers in full protective gear collect dead chickens killed by using carbon dioxide, after bird flu was found in some birds at a wholesale poultry market in Hong Kong. (AP Photo/Kin Cheung, file)

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