TABLE 1.

Pairwise distances within persistent clusters of L. monocytogenes from dairy farms A to C

Cluster	CCa	STb	CTc	N d	Farm(s)	Pairwise distance (no. of SNPs)
						Mean	Minimum	Maximum
C1	8	8	9176	8	A	1.5	0	4
C2	14	14	9177	34	A	3.6	0	12
C3	14	91	9178	18	A	2.6	0	7
C4	14	91	9179	8	A, B	2	0	6
C5	18	18	9180	8	B	3.3	0	8
C6	18	18	9181	6	B	1.7	0	10
C7	20	20	9182	32	C	2.4	0	7
C8	20	20	9189	5	B	3.5	0	9
C9	20	20	9183	6	A	3.9	0	10
C10	20	20	9184	5	B	2.4	0	6
C11	20	20	9185	9	C	5.8	0	11
C12	20	20	9186	4	B	1.5	0	6
C13	37	37	9187	20	A	2.6	0	7
C14	37	37	9188, 9205	7	A	2.2	0	6
All clusters						2.8	0	8

^aCC, clonal complex.

^bST, multilocus sequence typing (MLST) profile.

^cCT, core genome multilocus sequence typing (cgMLST) profile.

^dNumber of isolates in the persistent cluster.