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Comparison of AIX1000 titer to ASI titer. Differences in the AIX1000 titer dilutions compared to the ASI card titer dilutions of retrospective (A) and prospective (B) specimens are shown. The dotted lines represent a ±1-dilution-factor (2-fold) difference from the ASI card manual titer result. Specimens that gave discordant RPR screen results and/or were not confirmed by treponeme-specific testing are excluded.
