Dr. Damien Barrett:

The trouble with TB is the context. The context in which the question is being asked is very important. I do not think this aspect is a showstopper in any circumstances but it could have quite a contribution to make in a situation where we have many susceptible animals together in a particular set of circumstances, say, where animals are housed closely together and densely stocked. I could not give the Deputy a ranking of where this factor comes in terms of a score from one to ten because it is specific to the context.