Teenage girl Annie McWay died in 2000 from a human form of madness, vCJD (variant of the Kreutzfeld-Jacob disease).
Claire was one of nearly 200 people who died of an outbreak in the 1990s. Experts have now warned that some Britons can still "silently" wear this disease today. And that their concern is that they do not know how many more they will die from the disease.
View full documentary Disease of a Crazy Cow: Great British Beef Scandal on Thursday July 11 at 9:00 pm, on BBC Two. It is also available on iPlayer