Additional file 1: Figure S1. of Bovine tuberculosis visible lesions in cattle culled during herd breakdowns: the effects of individual characteristics, trade movement and co-infection

Graphical exploratory assessment of the relationship between the probability of bovine TB visible lesion (VL) presence and the bovine minus avian tuberculin (b-a) reaction sizes (mm) at the disclosing test for cattle culled in Northern Ireland during bTB breakdowns (n = 5698). The LOWESS curve (grey solid line) is a locally weighted regression line (bandwidth: 0.5); orange line represent b-a as a log-transformed predictor. Note, that the log-transformed predictor fails to address the increasing risk at negative b-a values, due to this the b-a variable was modelled as a categorical variable. (PDF 159 kb