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. 2002 Nov;9(6):1183–1191. doi: 10.1128/CDLI.9.6.1183-1191.2002

FIG. 4.

FIG. 4.

Validation of the tandem PRRS ELISA. The reactivities of a total of 1,571 negative pig sera, EU PRRS-positive pig sera, and US PRRS-positive pig sera were tested in both the EU PRRS ELISA (top panel) and the US PRRS ELISA (bottom panel). The distribution of sera based on their reactivities is shown. Cutoff values at 5 and 10% reactivity are indicated. Reactivity of <5%, negative for PRRSV antibodies; reactivity of ≥5% and <10%, questionable for PRRSV antibodies; reactivity of ≥10%, positive for PRRSV antibodies.