FIG 1.

Genotype analysis of the O157:H7 strains implicated in the 2009 cookie dough-associated outbreak. (A) Hierarchical cluster dendrogram generated using the number of probe sets that were greater than 3-fold different in 610 strains. Scale bars represent the number of probe set differences, and O157:H7 strains are enclosed by the gray box. Clinical and food strains from the outbreak are indicated by the red and blue circles, respectively. (B) Scatter plots generated using the RMA intensities from all 41,932 probe sets for comparing two clinical isolates (left) and a clinical isolate and a food isolate (right).