Badger culling in the United Kingdom is permitted under licence, within a set area and timescale, as a way to reduce badger numbers in the hope of controlling the spread of bovine tuberculosis (bTB). Humans can catch bTB, but public health control measures, including milk pasteurisation and the BCG vaccine, mean it is not a significant risk to human health. The disease affects cattle and other farm animals (including pigs, goats, deer, sheep, alpacas, and llamas), some species of wildlife including badgers and deer, and some domestic pets such as cats. Geographically, bTB has spread from isolated pockets in the late 1980s to cover large areas of the west and south-west of England and Wales in the 2010s. Some people believe this correlates with the lack of badger control.