Figure 4.

Boundary locations of areas in which tuberculosis (TB) was identified, or was strongly suspected to be present, in possums in New Zealand, showing the maximum size of the areas during 1980 (dark blue), 1994 (green), 2005 (sky blue), and the additional area identified in 2012 (orange). A number of the areas were subsequently declared free of TB or their size was reduced following the eradication of TB from the possum population. These changes are not shown on the map. This Figure uses the 1980 boundary from Figure 3 and then uses additional information compiled by PG Livingstone to define the boundaries for 1994, 2005 and 2012, based on GIS mapping.