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A Chinese health worker takes excrement samples from a chicken at a closed poultry market in Nanjing in east China's Jiangsu province on Saturday, April 6, 2013. Health officials believe humans are contracting the H7N9 bird flu virus through direct contact with infected fowl and say there's no evidence the virus is spreading easily between people. (AP Photo)

A Chinese health worker takes excrement samples from a chicken at a closed poultry market in Nanjing in east China's Jiangsu province on Saturday, April 6, 2013. Health officials believe humans are contracting the H7N9 bird flu virus through direct contact with infected fowl and say there's no evidence the virus is spreading easily between people. (AP Photo)

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