Badgered?

News that the UK government is to move away from attempting to control TB in English dairy cattle by badger culling is timely (https://www.theguardian.com/environment/2020/mar/05/badger-cull-phased-out-replaced-vaccinations-bovine-tb-england). Although many farmers have generally been enthusiastic about the cull, it actually seems to result in the badgers roaming more widely and thus disseminating the disease. It is also the case that both cattle and badgers (and other wild animals?) can be repositories of the TB agent, so transmission can be in both directions. So it makes sense to vaccinate both species in areas where they coexist. I think the reason this has been resisted until now is because vaccination of cattle will result in antibodies in the blood of the cows and their absence used to be regarded as a simple confirmation that the herd was TB-free.