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The correlation between the outcomes of serum and milk ELISA results (180 measurements; 7 cows; R2 = 0.5358; p ≤ 0.00). The cut-off value used for the milk samples depends on a sample-to-positive (S/P) ratio ≥ 30 while that of the serum samples was S/P ≥ 55. Each dot indicates one milk and serum ELISA outcome (cows were measured repeatedly).
