FIG. 1.

Performances of the different PCR methods for each DNA target in 2007. A to H, participating centers. The two DNA targets, the B1 gene (left bar) and rep529 (right bar), are compared for each center. The numbers within the bars represent the 0.2 (top) and 0.1 (bottom) scores obtained by the different participants in 2007 (score decimal numbers were rounded to the nearest whole number). Chi-square tests showed that rep529 yielded significantly better performances than the B1 gene in five out of six laboratories that tested both targets (P values shown at the top of the figure). *, an 0.1 score was not available for laboratory C and, consequently, the chi-square test was performed using the 0.2 score; nd, not done; ns, not statistically significant at 95% confidence (P = 0.08). Summarized details of the scores, PCR technology, and primers for each participant can be found in Table S2 in the supplemental material.