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Table 2 All 9 individually analyzed facilities had evidence of persistent Lm. Groups of Lm from each facility are organized by clonal complex and in some cases group number. I.e. in facility B there were two genetically distinct groups of CC321 isolates based on SNP distance

From: Genomic analysis of Listeria monocytogenes from US food processing environments reveals a high prevalence of QAC efflux genes but limited evidence of their contribution to environmental persistence

Facility

CC (group #)

Collection Period

Mean (Max) Pairwise SNPs

Isolates

(n)

bcrABC

(n)

qacH

(n)

Facility A

CC6

2009–2016

3.7 (6)

14

0

0

Facility A

ST1048

2016–2019

4.7 (7)

4

0

0

Facility B

CC321 (1)

2013–2018

1.3 (3)

14

14

0

Facility B

CC321 (2)

2011–2013

3 (5)

3

3

0

Facility C

CC321

2011–2017

7.1 (18)

47

47

9

Facility C

CC5

2004–2017

14 (28)

18

0

17

Facility D

CC155

2011–2014

10 (17)

7

7

0

Facility D

CC199

2011–2014

11.8 (19)

4

4

0

Facility D

CC321

2000–2017

13.7 (23)

20

20

0

Facility E

CC6

2011–2013

5.1 (11)

9

1

0

Facility E

CC155

2011–2017

10.8 (21)

15

13

0

Facility F

CC6

2015–2018

11 (20)

13

13

0

Facility G

CC11

2012–2019

7.8 (16)

10

10

0

Facility H

CC5

2016–2019

4.1 (7)

11

3

0

Facility I

ST2629

2008–2012

6.2 (15)

43

0

0