The United States Department of Agriculture confirmed Tuesday that it found a case of bovine spongiform encephalopathy (BSE) in a dairy cow from central California.
The infected cow was found as part of a "targeted surveillance system," says John Clifford, the USDA's chief veterinary officer. This is the nation's fourth confirmed case of the ailment commonly known as mad cow disease.
"The animal was never presented for slaughter for human consumption, so it at no time presented a risk to the food supply or human health. Additionally, milk does not transmit BSE," Clifford added.
The animal tested positive for atypical BSE, a very rare form of the disease not generally associated with an animal consuming infected feed.
The USDA has begun contacting world agencies and trading partners but does not expect the finding to affect beef exports.
Earlier rumors sent live cattle futures plummeting on the Chicago Mercantile Exchange as the result of a mass sell-off, reported Reuters.
Worldwide cases of BSE peaked in 1992 with 37,311 confirmed cases. In 2011, there were 29 cases.
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