Figure 1.

SBA titers (IC50) obtained from the precision test, performed by probing standard sera in 12 independent replicates, on 3 different days and by two operators against the S. Typhimurium D23580 and S. Enteritidis CMCC4314 strains. Single repeats of each operator are represented by circles (for operator 1) and triangles (for operator 2), and repeats on different days are shown in red for day 1, green for day 2, and blue for day 3. Geometric means and geometric standard deviations from all repeats are represented by the grey lines for each of the strains.