Experts unclear how China bird flu infec

Experts unclear how China bird flu infects humans
Associated Press

A family watches a worker spray disinfectant in Naidong village, where a boy tested positive for the H7N9 virus, in Beijing Monday, April 15, 2013. The new case of bird flu in China's capital, a 4-year-old boy who displayed no symptoms, is adding to the unknowns about the latest outbreak that has caused 63 confirmed cases and 14 deaths, health officials said Monday. (AP Photo) CHINA OUT

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