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Table 2 Numbers of super-shedder (SS) v and low-shedder (LS) w isolates from both samplings sharing restriction endonuclease digestion pattern clusters (REPC, 90% or greater similarity) and description of most prevalent REPC, REPC A by feedlot and pen

From: Genetic diversity and antimicrobial resistance among isolates of Escherichia coliO157: H7 from feces and hides of super-shedders and low-shedding pen-mates in two commercial beef feedlots

 

All REPCx

REPC A only

Feedlot

Pen

No.SS

No.LS

No. SS sharing REPC with LS (%)

No. SS in SS only REPC (%)

No. isolates

No, SS fecal

No. SS hide

No. LS fecal

A

1*

3

16

1 (33)

2 (67)

15

1

1

13

 

2*

36

47

12 (33)

24(67)

41

12

6

23y

 

3

12

100

11(92)

1(8)

5

4

1

0

 

4

19

56

0 (0)

19 (100)

11

9

2

0

 

5

7

27

0(0)

7 (100)

4

4

0

0

 

6

3

2

0(0)

3(100)

1

1

0

0

 

7

0

1

NAz

NA

2

0

0

2

B

1

27

76

4(15)

23 (85)

12

12y

0

0

 

2*

44

116

9 (20)

35 (80)

120

9

10

101y

 

3*

10

23

1(10)

9 (90)

19

1

0

18

 

4

1

31

0 (0)

1(100)

5

0

0

5

Total

 

162

496

38 (23)

124 (77)

235

53

20

162

  1. Pens where SS and LS isolates belonged to REPC A are marked by *, percentages are bracketed.
  2. vSuper-shedder, shedding at least 104 CFU E. coli O157:H7/g feces.
  3. wLow-shedder, shedding < 104 CFU E. coli O157:H7/g feces.
  4. xAll REPC, number of super-shedders based on fecal isolates, super-shedder fecal and hide swab isolates included in REPC shared with low-shedders.
  5. yIncludes isolates from the second sampling.
  6. zNA, not applicable, no super-shedders in pen.