In this group, the participants did not perform BSE in the 6 months prior to BSE training.
Britain diagnosed its first case of BSE in 1986.
1993-1995 Four cases of CJD reported in dairy farmers who had BSE in their herds.
Millions more are also being spent on controls against bovine tuberculosis and BSE in cattle.
The worst years for cattle deaths from BSE in England, Scotland and Wales, was 1992 (36,680) and 1993 (34,370).
But some scientists are now worried that cases of BSE in sheep may have been misdiagnosed as scrapie.
Writing on the Guardian's website, Professor Lang says the FSA findings on dirty chicken are on a par with previous food scandals over salmonella in eggs and BSE in cattle.
They say that the brain-wasting disease takes time to develop, and that there is therefore no reason to test for BSE in cows under 30 months old.
Indeed it was the knowledge that scrapie-infected sheep posed no threat to humans that contributed to initial complacency about BSE in cattle.
Britain - desperate to keep its 'green and pleasant' label - tried to deny the presence of brain-rotting BSE in cow populations during the late 1990s.
A first case of BSE in the United States in 2003 involved a Canadian cow, but the new case is homegrown.
