Bovine spongiform encephalopathy and new variant Creutzfeldt-Jakob disease.

Bovine spongiform encephalopathy (BSE) and Creutzfeldt-Jakob Disease (CJD) belong to a group of degenerative neurological disorders collectively known as the transmissible spongiform encephalopathies (TSEs). The group also includes scrapie of sheep and goats, kuru of humans, chronic wasting disease of mule deer and elk and transmissible encephalopathy of mink. These fatal diseases cause behavioural changes, alterations of sensation, changes in mental state and ataxia. The typical pathology is non-inflammatory vacuolation (spongiosis) in neuronal perikarya and in the grey matter neuropil. Occasionally, there may also be amyloid plaque deposition in certain regions of the brain and, less frequently, the spinal cord. All the diseases have long incubation periods which, depending on the host, may range from many months to several decades. Death is inevitable after a slow progressive illness. In this review, I shall cover the recent UK outbreak of BSE and its relationship to new variant Creutzfeldt-Jakob disease.