We were much closer to this with the mad cow disease in the early 2000s (in the US, earlier in the UK), but despite the fact that cows are in many ways in our food chain and even though prions withstand almost all forms of sterilization, we got very very very few cases of CJD in humans.
So, the contamination from animals is an astronomically low probability. From deer orders of magnitudes lower than from cows.
But contamination from self-replicating gene-integrating prion regions via multiple injections is much much higher.
We were much closer to this with the mad cow disease in the early 2000s (in the US, earlier in the UK), but despite the fact that cows are in many ways in our food chain and even though prions withstand almost all forms of sterilization, we got very very very few cases of CJD in humans.
So, the contamination from animals is an astronomically low probability. From deer orders of magnitudes lower than from cows.
But contamination from self-replicating gene-integrating prion regions via multiple injections is much much higher.