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HEFEI, CHINA - APRIL 09:  (CHINA OUT) Medical workers take part in a drill that simulates human infection of the H7N9 bird flu virus on April 9, 2013 in Hefei, China. Four new H7N9 avian influenza infections were confirmed in east China on Tueaday. So far, China has reported 28 H7N9 bird flu cases, including nine deaths.  (Photo by ChinaFotoPress/Getty Images) ChinaFotoPress/Getty, ChinaFotoPress