Table 3.

The presence of plasmids (based on the identification of plasmid replicons) in serotypes and genetic subpopulations of non-typhoid Salmonella , categorized according to the plasmids’ estimated size into ‘small’ (<6000 bp), ‘intermediate’ (≥6 000 bp, <100000 bp) and ‘large’ (≥100000 bp). The total number and the extent of overlap between plasmid size groups within serotype and genetic subpopulations are presented

Plasmid size* category	Grouping method	Found in (n)	Alone	Overlap with other plasmid size categories
Small (<6000 bp)	Serotype	36	0 (0 %)	36 (100 %)
	Subpopulation	94	11 (11.7 %)	83 (88.3 %)
Intermediate (≥6000 bp, <100000 bp)	Serotype	37	0 (0 %)	37 (100 %)
	Subpopulation	103	20 (19.4 %)	83 (80.6 %)
Large (≥100000 bp)	Serotype	34	1 (2.9 %)	33 (97.1 %)
	Subpopulation	77	11 (14.3 %)	66 (85.7 %)

*Approximate average sizes for Col/Inc plasmid groups were determined using Carattoli et al. [19] (as detailed in the the Methods section).