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Table 1 MPN and PCR result for the samples tested

From: Assessment of Listeria monocytogenes in pet food

Sample numbers

Types of samples

Replicates

MPN/g

PCR analysis

1

Wet food (packed)

Cat food

1.1

1.2

< 3

< 3

*a

2

Dry food (repacked)

Dog food

2.1

2.2

< 3

< 3

–b

3

Wet food (packed)

Dog food

3.1

3.2

< 3

< 3

–

4

Wet food (packed)

Cat food

4.1

4.2

< 3

< 3

*

5

Wet food (packed)

Cat food

5.1

5.2

< 3

< 3

–

6

Dry food (packed)

Cat food

6.1

6.2

< 3

< 3

–

7

Treat (unpacked)

Dog treat

7.1

7.2

< 3

< 3

–

8

Wet food (packed)

Dog food

8.1

8.2

< 3

< 3

*

9

Wet food (canned)

Dog food

9.1

9.2

< 3

< 3

–

10

Wet food (packed)

Cat food

10.1

10.2

< 3

< 3

*

11

Dry food (packed)

Cat food

11.1

11.2

< 3

< 3

–

12

Wet food (canned)

Cat food

12.1

12.2

< 3

< 3

–

13

Dry food (repacked)

Dog food

13.1

13.2

< 3

< 3

–

14

Treat (unpacked)

Dog treat

14.1

14.2

< 3

< 3

–

15

Treat (unpacked)

Dog treat

15.1

15.2

< 3

< 3

–

16

Treat (unpacked)

Dog treat

16.1

16.2

< 3

< 3

–

17

Treat (unpacked)

Dog treat

17.1

17.2

< 3

< 3

–

18

Dry food (repacked)

Dog food

18.1

18.2

< 3

< 3

–

19

Dry food (repacked)

Dog food

19.1

19.2

< 3

< 3

–

20

Dry food (repacked)

Cat food

20.1

20.2

< 3

< 3

–

21

Treat (packed)

Dog treat

21.1

21.2

< 3

< 3

–

22

Treat (repacked)

Dog treat

22.1

22.2

< 3

< 3

–

23

Dry food (repacked)

Cat food

23.1

23.2

< 3

< 3

–

24

Treat (repacked)

Dog treat

24.1

24.2

< 3

< 3

–

25

Household leftover

Dog food

25.1

25.2

23

9.2

–

26

Household leftover

Dog food

26.1

26.2

> 1100

> 1100

–

27

Household leftover

Dog food

27.1

27.2

460

240

–

28

Household leftover

Cat food

28.1

28.2

< 3

< 3

–

29

Household leftover

Dog food

29.1

29.2

< 3

< 3

–

30

Household leftover

Dog food

30.1

30.2

< 3

< 3

–

31

Household leftover

Cat food

31.1

31.2

< 3

< 3

–

32

Household leftover

Cat food

32.1

32.2

< 3

< 3

–

  1. aSymbol (*) indicates PCR analysis was not performed due to unavailability of primers
  2. bSymbol (±) indicates positive and negative result of the presence of L. monocytogenes