A few years ago, scientists were saying that viruses were species specific, but I believe since then the viruses evolved to be able to infect humans. But now, according to a PBS special on mad cow aka CJDv, it is caused by a special particle called a prion. This prion is not living matter, like bacteria, but kinda like a virus. It can't be killed by normal means such as bleach, boiling, cooking etc, the only way to kill it is to heat it to 900 degrees F. Guest what? for all the non-bullet casters around here, lead melts at 900. There is no know cure. On the same program, the scientist buried the prions in his backyard, and 6 months later, it was still active! I think there is some info about mad cow on the PBS website at www.pbs.org, and do a search on "mad cow," I got something is 70 hits.
Oh yes forgot to mention that mad cow is now confirmed in Japan. See link for furhter info[url]http://www.latimes.com/news/nationworld/world/la-000076355sep23.story?coll=la%2Dheadlines%2Dworld[/url]