Some of the costs are largely illusionary. Yes we stop food that is tested positive from bovine TB from getting into the food chain but this ignores that the tests are not accurate so there is likely meat that is infected getting into the foodchain anyway. Bovine TB is mostly in parts of cattle that are not eaten and cooking kills the TB bacterium. At the same time almost all milk is pasteurised so again the bacterium is killed posing no risk to human health. [1]  The main difficulty with the argument that a cull will prevent TB is that we do not know which way infections run. Do badgers infect cattle or the other way around. Currently the evidence suggests that it is cattle that infect badgers this is why there are areas with high badger populations without bovine TB problems such as the north of England. It is all but certain that any large jumps in infection over large distances are the result of cattle to cattle transmission. [2] Looking at the chart presented it is clear that the biggest jump from under 2000 to over 5000 infected herds occurs immediately after foot and mouth suggesting the increase was a result of cattle movements.  [1] ‘expert reaction to TB test-positive cattle entering the food chain’, Science Media Centre, 1 July 2013,   [2] Dawson, D.G., ‘Badgers and TB, where is the science?’, University of Birkbeck, March 2013,  (6, 10, 11)