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Distribution of anti-IgA porcine epidemic diarrhea virus (PEDV) ELISA sample to positive (S/P) ratios on (A) serum and (B) fecal samples distributed according to PEDV challenge status of the animal (no, yes) relative to the assay cut off (full line). An S/P ratio higher or equal to 0.14 was considered positive for serum samples and an S/P ratio higher or equal to 0.13 was considered positive for fecal samples.
