People ask about this years after the event, usually after a diagnosis in the family has sent them back over what they ate in the 1980s and 1990s. The honest position is that exposure then cannot be measured now, and that the form of CJD linked to beef has become very rare.
What was the link between cattle and people?
BSE, known at the time as mad cow disease, spread through cattle feed that contained protein made from other ruminants. The agent survives heat, so processing did not destroy it.
Eating products from infected cattle caused variant CJD in people. The world animal health organisation describes compelling indications that variant CJD can be acquired from contaminated beef products, and says the number of clinical cases has been extremely low. It describes deboned skeletal muscle, which is ordinary meat, and milk and milk products as safe.
Variant CJD covers the human illness, and BSE the disease in cattle.
What is done now to keep it out of food?
Three things, in order.
Feed. Ruminant protein was banned from cattle feed, then mammalian protein from ruminant feed. These measures are described as strongly effective in controlling exposure.
Slaughter. The tissues that carry most of the infectivity, including brain and spinal cord, are removed during slaughter and processing and kept out of both the food chain and animal feed.
Tracing and surveillance. Cattle are identified individually so animals can be traced, suspect animals are destroyed, and carcasses are disposed of rather than used.
Why do cattle cases still turn up?
Because surveillance is looking for them, which is the system working rather than failing.
Scotland is a recent example. The Scottish Government records a case of classical BSE confirmed on a farm in Dumfries and Galloway on 19 August 2026. The animal was not presented for slaughter and did not enter the food chain. The same page records a case of a different type confirmed there in December 2024.
Farmers and vets must report a suspected case immediately to the Animal and Plant Health Agency, and not reporting is an offence.
What is atypical BSE?
A second kind, called H type and L type, thought to arise on its own at a very low rate in cattle everywhere, and found mainly in older animals. There is no evidence that it spreads, though precautions continue because that cannot be ruled out. Animals found with it are destroyed and kept out of feed and food.
This is mainly relevant for reading news reports. A case described as atypical is not evidence that the old epidemic is returning.
Am I at risk from beef today?
Cattle cases are now estimated to be close to zero per million animals worldwide, and the controls above sit between any single case and the food supply. Nothing in the sources here suggests a reason to change what you eat.
If you are worried about a specific past exposure, your GP can put the question to the national prion surveillance service. Nothing on this page can assess an individual’s risk.
Where next
Deer, venison and CWD covers the same question for deer. Is CJD contagious? covers person to person spread, and the other questions are on the safety hub. The research version, with the feed, slaughter and species barrier evidence, is the food chain.