By Brad Knickerbocker writer of The Christian Science Monitor
The Christian Science Monitor
This week a cow in Alabama became the third confirmed case of mad cow disease in the US since December 2003. But what appears to be a relatively isolated incident points out the difficulty of preventing - or even detecting - such cases under the current voluntary testing regimen. The news also makes it more difficult for US officials to convince overseas consumers that American beef is safe.
The cow in question, discovered on an unidentified farm, initially tested "inconclusive" last week.
On Monday, after a more thorough test at US Department of Agriculture (USDA) labs in Ames, Iowa, officials confirmed that the animal (which had been euthanized by a veterinarian and buried on the farm) had mad cow disease. USDA officials now are trying to trace the cow's herd of origin and offspring.
Mad cow, known scientifically as bovine spongiform encephalopathy (BSE), is believed to be carried by animal feed made from cattle brains or spinal cord. Such feed is now banned in the US and other countries, but cases of BSE have continued to appear around the world.
Although medical authorities attribute 150 deaths in Europe in the 1980s and 1990s to the human form of the disease, no such human cases have been reported in the United States.
About 650,000 cattle are tested
Since the first case of BSE was reported here in 2003, the number of cattle tested for the disease has increased substantially. Still, only about 650,000 of the total US herd (some 35 million slaughtered annually) have been tested - a rate far lower than the percentage tested in Europe or Japan.
Of those tested, two have turned up positive for BSE. That is "evidence that the prevalence of this disease in the United States is extremely low," says Terry Stokes, chief executive officer of the National Cattlemen's Beef Association.
"The bottom line for consumers remains the same," Mr. Stokes says. "Your beef is safe."
That's the same position taken by USDA officials, who are responsible for ensuring the safety of agricultural products as well as promoting the $48 billion beef industry here and abroad.
Cows origin and age difficult to trace
The USDA's inspector general last month found problems in sampling for and tracking of mad cow disease. …