Experts unclear how China bird flu infects humans

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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 OUTBEIJING (AP) — Almost three weeks after China reported finding a new strain of bird flu in humans, experts are still stumped by how people are becoming infected when many appear to have had no recent contact with live fowl and the virus isn't supposed to pass from person to person.

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