There is an experimental existing drug combo of trimipramine+fluphenazine that might help prion disease but it won't cure it: https://medicalxpress.com/news/2011-09-screen-antidepressant.... The corresponding paper is https://pubmed.ncbi.nlm.nih.gov/21931860/

The Canadian government looks to have both failed and abandoned its people. It could have tested them, profiled the disease, understood its cause, and tried treatments, but it looks to just not care.

In the simple case, if it's just a neurotoxin, it might show signs of getting better upon moving out.