I guess this should put it into perspective
"Your risk of mad cow disease: 1 in 10 billion
Odds of winning the Powerball grand prize: 1 in 146 million
The disease has never been diagnosed in a human in the United States, according to the CDC, and only three cases of bovine spongiform encephalopathy (BSE, or mad cow) have popped up in American cows. (They were caught before they entered the food supply.) In theory, it's possible that if humans eat beef damaged by BSE, they may develop variant Creutzfeldt-Jakob Disease (vCJD) -- a fatal brain disorder that often lies dormant for a decade before symptoms appear. But even in the United Kingdom, home to 98 percent of all BSE cases linked to beef (or blood transfusions from a person who's been exposed to the tainted meat), the CDC estimates the risk for humans is just 1 in every 10 billion servings of beef. A few years ago there was worry about supplements and cosmetics made with certain cattle parts, but the Food and Drug Administration stopped the use of those parts."