Fig. 4
Spearman’s correlation coefficient (rs) for the serum and OT ELISA results (rs [407] = 0.6687, P < 0.0001). Red filled circles indicate the individual results for each sampled dog. The horizontal solid black line indicates the cut-off: 35 EU in serum ELISA (Y-axis) and 28 EU in OT ELISA (X-axis). ELISA enzyme-linked immunosorbent assay, EU ELISA units, OT oral transudate