There has been a steady reduction in the levels of bovine tuberculosis (bTB) in Ireland for some years. This paper presents a number of methods employing geographical information systems to examine how this reduction is manifested in space and time. The focus of disease mapping has traditionally been placed on identifying areas with problems. There has been limited work done in visualising improvements. The authors describe recent spatial changes in the relative incidence of bTB in Ireland across an uniform hexagonal grid, comparing the mean of the annual animal level bTB incidence during the 10-year period from 1998 to 2007 to the years 2008 to 2012. The authors map bTB incidence trends for three successive five-year periods (1998–2002, 2003–2007 and 2008–2012). Finally, the authors investigate the change in extent and severity of interpolated bTB reactor density over time.
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