The alarm sounded by Canada's recently confirmed case of bovine spongiform encephalopathy (BSE) has reaffirmed the exigency of establishing improved safeguards and more aggressive surveillance protocols in North America and around the world. Research converging on the probable causative agent-prion proteins-calls for intensive assessment of the headway gained in tracing prions, testing for transmissible neurodegenerative diseases, and developing methods for cornering the epidemic. Administered by an illustrious panel of 36 international contributors, this timely book marshals techniques for prion protein assay and diagnosis of transmissible spongiform encephalopathies (TSEs).