A clade of Listeria monocytogenes serotype 4b variant strains linked to recent listeriosis outbreaks associated with produce from a defined geographic region in the US - Fig 3

Maximum likelihood trees (bootstrapping n = 1000) obtained of the 4b isolates using CFSAN023463 (A) or F2365 (B) as the reference strain for the CFSAN Pipeline analysis. The scale bars indicate distance as assessed by the Tamura-Nei Method [32].