Table 1.

Maximum pairwise SNPs measured during investigations into foodborne illness outbreaks and contamination events.

Organism	Maximum SNP count (number)	Maximum SNP count (range)			Reference
		<21	21–100	>100
E. coli	4	X			Underwood et al., 2013
E. coli	15	X			Eppinger et al., 2011
L. monocytogenes	9	X			Chen et al., 2017c
L. monocytogenes	12	X			Chen et al., 2017a
L. monocytogenes	18	X			Li et al., 2017
L. monocytogenes	20	X			Wang et al., 2015
L. monocytogenes	21		X		Nielsen et al., 2017
L. monocytogenes	28		X		Gilmour et al., 2010
L. monocytogenes	29		X		Chen et al., 2017b
L. monocytogenes	42		X		Chen et al., 2016
L. monocytogenes	67		X		Jackson et al., 2016
S. enterica	2	X			Wuyts et al., 2015
S. enterica	3	X			Allard et al., 2016
S. enterica	3	X			Taylor et al., 2015
S. enterica	6	X			Hoffmann et al., 2016
S. enterica	12	X			Octavia et al., 2015
S. enterica	30		X		Leekitcharoenphon et al., 2014

The maximum SNP counts for isolates that were traced back to the same source in the original study are presented. Whether the maximum SNP counts are less than 21 SNPs, 21 to 100 SNP, or greater than 100 SNPs is also indicated.