Scrapie infected tissues

We have been asked to prepare slides from scrapie infected tissues. I have been able to find a couple of abstracts regarding this disease but we are still skeptical about processing these tissues with our routine specimens. Has anyone worked with this disease? If so, what precautions were taken (other than the normal precautions)? I have been told by a researcher from the USDA that formalin does not stabilize the disease. However, I have also been told that formic acid or sodium hydroxide will fix/stabilize the tissue. I would appreciate any information from someone who has worked with this disease.