Let's start disseminating good info on this topic, as misunderstandings abound. PETA says this, which seems factually accurate if incredibly biased (I trimmed out a lot of the preaching):
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What Is Mad Cow Disease?
BSE is caused by malformed proteins called prions. Researchers have traced recent outbreaks of the disease to farmers’ cost-cutting practice of mixing bits of dead sheep’s neural tissue into the feed of cows, who are naturally herbivorous. If cows eat the brains of other cows who already have BSE or of sheep suffering from a sheep disease called scrapie, the animals can develop mad cow disease. When people eat the infected cattle, they could develop the human version of the disease, new variant Creutzfeldt-Jakob disease (nvCJD). Millions of cattle suspected of being infected with BSE in England, Scotland, Ireland, France, Belgium, Italy, and other countries have been slaughtered.
Whether it strikes cattle or people, mad cow disease is always fatal. There is no treatment. The disease eats holes in the brain. In humans, it initially causes memory loss and erratic behavior, and over a period of months, its victims gradually lose all ability to care for themselves or communicate, and eventually, they die. So far, more than 120 people in Europe have died from nvCJD.
Doesn’t the government protect the meat supply?
Because the infected cow was raised for dairy production, she had lived long enough to show symptoms of the disease. Most cows are killed before they turn 2 years old, and before they become symptomatic; no one would know whether they were infected with spongy brain disease. The U.S. Department of Agriculture (USDA) admits that it only tested about 20,000 cows for BSE last year—a statistically insignificant percentage of the approximately 40 million cows slaughtered annually.
The dangerous practice of feeding sheep and even cows to other cows was not banned in the U.S. and Canada until 1997, and the U.S. government said that as recently as 2001, there was widespread violation of the feeding regulation. It is still legal to feed sheep and cows to pigs and chickens and to feed pigs and chickens to one another and to cows, even though these practices have been banned in Europe, and no one can be sure that they won’t also prove to be deadly.
Other forms of brain encephalopathies have been found in North America. In May, an 8-year-old cow on a dairy farm in Alberta, Canada, was found to have BSE. Two years ago, 200 sheep raised for dairy on a Vermont farm were killed on suspicion that they were infected with their species’ equivalent of mad cow disease. Chronic wasting disease, a similar condition, is widespread in deer and elk in Western Canada and the U.S. and is suspected of infecting hunters who may have eaten meat from sick animals.
Since brain encephalopathies have been found in cats, dogs, sheep, mink, deer, and elk, as well as in cows and people, you may not be protecting yourself by avoiding beef alone.
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www.peta.org