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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