The same thing was noted in Kentucky back in the '90s. A whole bunch of people acquired a "mad squirrel disease". Back then they were reporting it as a variant of mad cow. Like Creutzfeldt-Jakob, it's a prion disease. All of the affected people were squirrel brain-eaters. All of them died.
Same thing can happen from eating all sorts of brain, including human brains (Kuru disease).
Moral of the story: don't eat brains!
