Maximum likelihood trees for 4,037 concatenated protein-coding genes. Labels in blue indicate isolates from the USDA Food Safety and Inspection Service, labels in black indicate isolates from patients, and labels in red indicate references strains used to root the tree. Colored squares next to the accession numbers represent the PFGE banding pattern and inclusion or exclusion from outbreak 1609WAJPX-1. (A) Cladogram representation of the maximum likelihood tree, with bootstrap support values above 70 shown. (B) Phylogram representation of the maximum likelihood tree, with branch lengths proportional to the number of nucleotide substitutions per site. (C) PFGE banding patterns associated with CDC outbreak code 1609WAJPX-1.