Liang Wannian, head of a Chinese government office in charge of H7N9 

Liang Wannian, head of a Chinese government office in charge of H7N9 bird flu prevention control, left, and Michael O'Leary, head of the World Health Organization's office in China, attend a joint press conference 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)
Associated Press
Liang Wannian, head of a Chinese government office in charge of H7N9 bird flu prevention control, left, and Michael O'Leary, head of the World Health Organization's office in China, attend a joint press conference 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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