Fig. 2

Testing of antisera against the U.S. PEDV prototype and S-INDEL-variant strains by ProWV ELISA (a), ProS1 ELISA (b) and VarS1 ELISA (c). For each assay, the solid black line indicates the S/P ratio above which the sample was positive; the dot black line indicates the S/P ratio below which the sample was negative; samples with S/P ratios between the solid and dot black line were suspect. ProWV ELISA: the U.S. PEDV prototype strain whole virus-based ELISA; ProS1 ELISA: the U.S. PEDV prototype strain S1-based ELISA; VarS1 ELISA: the U.S. PEDV S-INDEL-variant strain S1-based ELISA