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ROC curve of in-house ELISA measuring serum anti-botulinum type D IgG levels for animals sampled in groups affected by botulism. The AUC is 0.941 (standard error, 0.034; 95% CI, 0.875 to 1.008), significantly better than that for the diagonal line (AUC = 0.5) (P < 0.000).
