Fig. 1

Concordance plots of the sample-to-positive ratios (S/P) between CHEKIT Q Fever Antibody ELISA kit (IDEXX kit) and PrioCHECK™ Ruminant Q fever Ab Plate Kit (Thermo Fisher kit) (a) or ID Screen® Q Fever Indirect Multi-species (IDVet kit) (b), and between IDVet and Thermo Fisher kits (c). The continuous line is the fitted regression line and the dotted line is the identity line. Using manufacturers’ guidelines for ruminants, illustrative S/P cutoff values were set at 0.3 (dashed line) and 0.4 (dash-dotted line) – S/P < 0.3: seronegative; S/P ≥ 0.3 and < 0.4: borderline; S/P ≥ 0.4: seropositive