(Reuters) – An 11-year-old cow in Alabama tested positive for bovine spongiform encephalopathy (BSE), commonly known as mad cow disease, the U.S. Department of Agriculture said on Tuesday.

The cow tested positive for the atypical L-type of BSE after exhibiting clinical signs at an Alabama livestock market, the USDA said in a press release. Atypical BSE can arise spontaneously in cattle herds, usually in animals 8 years old or older.

“This animal never entered slaughter channels and at no time presented a risk to the food supply, or to human health in the United States,” the USDA said. “Following delivery to the livestock market the cow later died at that location.”

The Alabama cow is the fifth detection of BSE in the United States, four of which were atypical.

“This finding of an atypical case will not change the negligible risk status of the United States, and should not lead to any trade issues,” the USDA added.

The only classical BSE case was an animal found in 2003 at a Washington farm that was imported from Canada and born before a 1997 ban on the use of cattle feed containing brain or spinal tissue, which can result in transmission of the disease.

China last month resumed imports of U.S. beef for the first time since banning them following the 2003 scare.

First detected in Britain in the 1980s, classical mad cow ravaged herds in parts of Europe until the early 2000s and was linked to the brain-wasting Creutzfeldt-Jakob disease in humans.

(Reporting by Michael Hirtzer; editing by Grant McCool)