World-leading bovine tuberculosis (bTB) TB cattle vaccination trials are set to get underway in England and Wales as a result of a major breakthrough by government scientists.  These trials enable work to accelerate towards planned deployment of a cattle vaccine by 2025.   It is one of several key elements of the long-term bTB strategy to eradicate the disease in England by 2038.   The field trials will be conducted over the next four years on behalf of Defra, the Welsh Government and the Scottish Government, following 20 years of ground-breaking research into bovine TB vaccines and diagnostic tests.