FIG 1.

Relationships by whole-genome multilocus sequencing type (wgMLST) of Listeria monocytogenes isolates with three pulsed-field gel electrophoresis (PFGE) patterns from 11 U.S. states associated with the 2014 pseudo-outbreak. Median (minimum to maximum) allele differences at node by wgMLST analysis performed using BioNumerics 7.5 and alleles were defined using an allele database generated to reflect the diversity of L. monocytogenes (Listeria database v.3). *, Isolates from uninoculated laboratory media plates; +, Isolates excluded from the pseudo-outbreak because of a clinical history compatible with listeriosis.