Fig. 4

The location of restricted herds during 2014–16. The colour coding and dates refer to the time of the initial bTB restriction of each herd. Repeat herd restrictions during this period are not included. The black hollow circle represents herds where 1 or more ‘total reactors’ or a factory lesion had been discovered in a sending herd in the previous, same or next year, relative to the year of the discovery of infection in the receiving herd. The black hollow circle with a cross in the middle represents herds where 2 or more standard reactors were discovered in a sending herd in the previous, same or next year, relative to the year of the discovery of infection in the receiving herd. In each case, for herds that were first restricted in 2016, the 2017 data for ‘next year’ were not included. The small and large orange cross indicates that one or 2 or more bTB-positive badgers (positive on culture), respectively, had been removed from that location during 2014–16. The ‘x’ represents badger removals conducted through the national programme