A vaccine for cattle does not yet exist in a form where it is possible to tell the difference between a vaccinated cow and a cow infected by bovine TB. This means that vaccinated cattle would have to be treated the same way as infected cattle so would not be salable. Vaccination is not 100% effective and would run the risk of other countries banning exports. [1] Vaccination of badgers on the other hand is costly with the first phase of the welsh trials having amounted to £662 per jab despite the vaccine itself costing much less. [2]  [1] ‘Cattle Vaccination’, Department for Environment, Food &amp; Rural Affairs, 24 January 2013,   [2] ‘NFU Cymru slams bovine TB vaccination costs’, NFU Cymru, 29 January 2013,