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Associated Press
Shu Yuelong, a virologist with China's Disease Control and Prevention Center or CDC, right, answers a question from a journalist during a joint press conference between Chinese health officials and World Health Organization representatives,  in Beijing, China, Monday, April 8, 2013.  The World Health Organization is talking with the Chinese government about sending international experts to China to help investigate a new bird flu strain that has killed six. Most of the 21 people stricken so far got severely ill.  (AP Photo/Ng Han Guan)

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