Fig 1.

Phylogenetic trees of (A) lineage I (n = 49), and (B) lineage II (n = 51) L. monocytogenes isolates from five food groups included in the 2010–2013 Lm MBS, constructed by the neighbor-joining algorithm using pairwise allelic differences generated by core genome multilocus sequence typing (cgMLST). Shown is the relatedness of the isolates and, for each isolate, the designation of serogroups, clonal complex (CC), sequence type (ST), the presence (filled space) and absence (open space) of full length inlA, plasmid, and selected genes associated with virulence and stress resistance. The food categories are color coded.