WUHAN, CHINA - APRIL 08: (CHINA OUT) Medical workers take part in a drill that simulates human infection of the H7N9 bird flu virus on April 8, 2013 in Wuhan, China. China is increasing efforts to stem a confirmed H7N9 bird flu outbreak which has infected at least 21 people and killed six. Many poultry wholesale markets have been closed in central and eastern China. (Photo by ChinaFotoPress via Getty Images)
08 Apr 2013
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