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. 2004 May;11(3):503–514. doi: 10.1128/CDLI.11.3.503-514.2004

FIG. 4.

FIG. 4.

Dot plot of S/P values of unexpected positive IDEXX ELISA results in herds expected to give negative results. The IDEXX ELISA, IFA, and bELISA were used to analyze 4,038 serum samples from herds expected to give negative results. Groups 1 and 4 had only one IDEXX ELISA-positive result (with negative IFA and bELISA results). Groups 2 and 5 had repeatable IDEXX ELISA-positive results (with negative IFA and bELISA results). Group 3 had repeatable IDEXX ELISA-positive results and IFA-negative results but bELISA-positive results. ANOVA was performed using MedCalc. The results seen with groups with superscripts sharing the same letter were not significantly different from each other (P < 0.001).