Fig. 4

Scatter plot of Coxiella burnetii DNA in bovine endocarditis lesions and corresponding serology results. ELISA S/P values >40 are considered to be positive, those ≤40 are considered to be negative. PCR Ct values ≤36 are considered to be positive, those between 36 and 40 are inconclusive and those >40 are considered negative. Samples with no amplicon present (i.e. below the detection limit) were assigned a nominal Ct value of 41. Cut-off values are indicated by red lines and inconclusive by a dotted line