An overview of bovine spongiform encephalopathy (BSE) in Britain.

Since 1985 cases of BSE have occurred in increasing numbers in the UK, particularly in dairy herds. Scientist, clinicians and administrators co-operated in showing that this was due to exposure to ruminant-derived meat-and-bonemeal products. The measures used to contain the epidemic and protect biological medicinal products are described. The epidemic will require continued control measures and monitoring until it finally declines.