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. Author manuscript; available in PMC: 2009 Aug 26.
Published in final edited form as: Oral Microbiol Immunol. 2009 Apr;24(2):116–123. doi: 10.1111/j.1399-302X.2008.00483.x

Fig. 2.

Fig. 2

Distribution of enzyme immunological units (EIU) scores representing cytolethal distending toxin (Cdt) -binding activity in sera at a 1:1600 dilution. To account for day-to-day variations in the enzyme-linked immunosorbent assays all data were converted EIU scores. The scores measured at a 1:1600 were chosen for evaluation because they most closely approached a normal distribution. The horizontal line depicts the cut-off value of EIU 200 (95th percentile) and separates the positive from the negative samples.