This is the same kind of thing as the "mad cow" disease that made the news years ago.
People were advised to not eat the brain and nerve tissues, which hold the prions.
However, I bet that meat processors still put those meats in dog food -- same dogs so many people be kissing in the mouth.
Since dogs only live about 15 years, and these prion sicknesses take decades to develop, our capitalist brethren are probably like
...
Speaking of "rare" meat, you should also know that pigs have viruses endemic to their genomes that cause cancers in humans. It's one of the hurdles med scientists are trying to overcome before they can use pig organs in transplant patients.