Can i get cjd by eating beef?

Possible, but rare.: It's possible, but rare. The defective protein (prion) that causes creutzfeldt-jakob can be inherited or come from a random spontaneous mutation. Cannibalism has also been implicated in its transmission. Eating contaminated beef products could possibly do it as well, but it isn't known how prevalent it is or what the risk is. It's still rare - 1 case per million per year.

Diseased beef: Creutzfeldt-jakob disease is a spongiform encephalopathy - a disease that makes holes in the brain like a sponge. It is caused by a prion, which is a non-living protein that causes a chain-reaction of poorly-structured brain proteins. It can come from any diseased animal and called scrapie in sheep and kuru in cannibalism. There is also a genetic form that is not from eating prions.