Scrive l'Organizzazione Mondiale della Sanita':

Epidemiology

• The first person to develop symptoms of what turned out to be vCJD became ill in January 1994. Most people who have developed vCJD have lived in the UK. Some of the patients had been long-standing residents in Wales, Scotland or Northern Ireland, and there was no preponderance of patients from any single part of the UK.
• As of early November 2000, the CJD surveillance unit for the UK reported 75 cases of vCJD, including 68 confirmed and 7 probable cases. In addition, there are 10 cases where vCJD is strongly suspected, but the diagnosis has not been definitively confirmed by post mortem analysis. In addition, three people in France and one in Ireland have been diagnosed with vCJD.
• Some of these patients have donated blood. However, to date vCJD has never been known to have developed in a recipient of this blood; study of possible transmission through blood transfusion continues. The UK no longer sources plasma from its inhabitants, and as a further precautionary measure, has instituted leukocyte reduction (removal of white blood cells) from blood transfusions. Some countries have disallowed donations of blood from persons who have been resident of the UK for longer than six months.