 the main G0 cluster shown in [Figure 0](#toxins-00-00000-f000){ref-type="fig"}. ^b^ Number of strains from our collection that contained a particular plasmid type. ^c^ AB = Alberta, Canada; BC = British Columbia, Canada; CH = Switzerland. ^d^ Numbers in brackets denote the number of plasmids belonging to each characteristic when more than one is listed in a cell. ^e^ Serotypes refer to *L. monocytogenes* strains only. ^f^ Plasmid size refers to the combined size of the assembled contigs contributing to each plasmid. ^g^ Mobile genetic elements (MGEs) included genes predicted to encode a mobile element protein, recombinase, transposase, integrase, invertase, or resolvase.  toxins-00-00000-t000_Table 0  ######   The characteristics of group 0 (G0) *Listeria* plasmids analyzed in this study and their associated strains. See [Table S0](#app0-toxins-00-00000){ref-type="app"} for plasmid contig Genbank accession numbers. Plasmids highlighted in yellow were retrieved from Genbank and are included in this study for comparison purposes.    ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------   Plasmid Type   Sub-Group ^a^   \# of Strains ^b^   Strain Origin(s) ^c