Keep focussed readers.. The existing model used worldwide for eradication of Tb from cattle herds is the well proven intradermal skin test. In countries with an environment uncontaminated by other mycobacteria, it is used alone. In the UK and some other countries it has evolved as a comparison test between m. avium and M. bovis. Nevertheless, this primary OIE / EU approved test has managed in the majority of countries worldwide, to clear bTb from the cattle herds with a programme of test and slaughter.
If the chattering voices citing cattle-to-cattle transmission are correct, this would have been unachievable. The only countries having problems are those where bTb has been allowed to establish in a wildlfe reservoir, which has proved a secondary but a maintenance source of disease. And in areas where regular testing and cattle culling have exceeded predictions and failed to stem the increase in disease, by default such reservoirs have become the primary source of spread.
We explored this on several occasions with Parliamentary questions to 'Baby' Ben Bradshaw, in his days manning the Animal Health desk for his boss. And most grateful we were for his patient replies:
Parliamentary Questions. 30th January 2004 Column 540W 
Mr. Bradshaw: All countries have either eradicated or have a programme to control bovine tuberculosis use one or more forms of the skin test. The government have close links with a number of countries in various stages of eradication and exchanges information and experience on the use of the tests in the context of these programmes.And on vaccination v. wildlife interface and the skin test:
The government is not aware of any country that has replaced the skin test as the primary test for bovine tuberculosis.
Parliamentary Questions 25. March 2004 col 989W. 
Mr. Bradshaw. Evidence from other countries shows that, in the absence of a significant wildlife reservoir, (of Tb ) cattle controls based on regular testing, and slaughter (of reactors), inspection at slaughterhouses, and movement restrictions (including tracing and contiguous testing), can be effective at controlling bovine Tb without vaccination."A case of tripping over the obvious?