Why more cases of ‘mad cow disease’ could emerge

Professor John Collinge (UCL Institute of Prion Diseases) features on a documentary about bovine spongiform encephalopathy (BSE) and its relation to variant Creutzfeldt-Jakob disease (vCJD), discussing the progress of research and vCJD's long period of dormancy in the brain.

Watch: BBC Two 'Mad Cow Disease: The Great British Beef Scandal' (from 39 mins 16 secs), Read: Telegraph (£)