World Health Organization’s China representative Michael O'Leary attends a press conference in Beijing Monday, April 1, 2013. Health officials said they still don’t understand how a lesser-known bird flu virus was able to kill two men and seriously sicken a woman in China, but that it’s unlikely that it can spread easily among humans. (AP Photo/Alexander F. Yuan)

Associated Press
World Health Organization’s China representative Michael O'Leary attends a press conference in Beijing Monday, April 1, 2013. Health officials said they still don’t understand how a lesser-known bird flu virus was able to kill two men and seriously sicken a woman in China, but that it’s unlikely that it can spread easily among humans. (AP Photo/Alexander F. Yuan)
World Health Organization’s China representative Michael O'Leary attends a press conference in Beijing Monday, April 1, 2013. Health officials said they still don’t understand how a lesser-known bird flu virus was able to kill two men and seriously sicken a woman in China, but that it’s unlikely that it can spread easily among humans. (AP Photo/Alexander F. Yuan)
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