Chinese health workers, wearing masks, walk past a group of security guards blocking a petitioner outside China's Health Ministry where a joint press conference between Chinese health officials and World Health Organization representatives was held 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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