NO TREATMENT. “Prion strains differ, but they do have one thing in common: they’re incurable. The prion plaques can’t be removed from the brain without killing the patient. Prions cannot be destroyed by antibiotics, chemotherapy, or anti-viral medications. So far, no treatment has been shown to cure a prion-infected animal or human.”
http://www.strangehorizons.com/2004/20040216/killer.shtml