Thank you all for the responses. I believe I misspoke when I brought up Kuru and MCD, as I was just trying to find a more... tangible disease than just "the jitters" that I'm familiar with. Most of the videos I've watched on the subject seemed to imply that cannibalism in any capacity will eventually cause some sort of extremely debilitating disease/condition, and was not aware how specific those two examples actually were.

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That said, I am still quite confused on the actual chain of events when cannibalism occurs (without prior infection like Kuru and MCD), for species that are affected negatively.