[Ericson2314]

I understand the argument here, and how ill-prepared we are for steady low-coefficient exponentials, but never more have I felt like the 2nd law of thermodynamics is my friend.

Even if 1 prion can kill you, even if prions will survive in the soil indefinitely, I think we are going to erode all the topsoil faster than the prions can accumulate in concentrations sufficient to cause issues.