(CNN) -- The first U.S. case of mad cow disease in six years sparked fears of illness that prompted at least one major South Korean retailer to suspend the sale of American beef.
However, public health officials said the risk of Americans contracting the disease is low, given that the affected dairy cow in central California never entered the human food chain and did not contract bovine spongiform encephalopathy through contaminated animal feed.
"It was never presented for slaughter for human consumption, so at no time presented a risk to the food supply or human health," said John Clifford, the Agriculture Department's chief veterinarian.
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http://edition.cnn.com/2012/04/25/health/california-mad-cow/?hpt=us_c2