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Chinese health workers collect dead chickens at Huhuai wholesale agricultural market in Shanghai on April 5, 2013.  Authorities in Shanghai began the mass slaughter of poultry at a market after the H7N9 bird flu virus, which has killed five people in China, was detected there, state media said.     CHINA OUT      AFP PHOTO        (Photo credit should read STR/AFP/Getty Images) Health workers collect dead chickens in Shanghai in Friday. (STR/AFP/Getty)