Fig. 1

Full (a) and abbreviated (b) phylogeny of the NCBI outbreak cluster of Listeria monocytogenes (environmental and clinical) from contaminated ice cream. a. Phylogeny of the full representative set of the NCBI outbreak associated cluster (environmental and clinical isolates associated with the 2015 listeriosis outbreak linked to ice cream). Listeria monocytogenes genomic data from pre-enrichment microbiomes from hours: 20 to 40 are shown clustering with WGS of individual isolates (blue shading) (that took five days longer to obtain). The outgroup (grey shading) is comprised of closely related genomes of Lm not associated with the outbreak. b. A phylogeny of an abbreviated set of clinical and environmental isolates associated with the 2015 listeriosis outbreak linked to ice cream. WGS genomes from the full Listeria monocytogenes enrichment protocol are shown clustering with genomic data of Listeria monocytogenes from pre-enrichment microbiomes from hours 20, 36 and 40 (blue shading). The outgroup (grey shading) is comprised of closely related genomes of Lm not associated with the outbreak. A full list of all isolates, sources and accession numbers used for the full tree and the abbreviated tree is available in Additional file 1