550 / 596
Vanilla Ice Cream (25 g)
1
2
For the low inoculation level of the MDA2 -
Listeria monocytogenes
assay, there were 7
3
presumptive positives and 7 confirmed positives following the AOAC 993.12 reference method
4
confirmation procedure. There were 7 observed positives for the reference method. For the high
5
inoculation level, there were 5 presumptive positives and 5 confirmed positives following the
6
AOAC 993.12 reference method confirmation procedure. There were 5 confirmed positives
7
following the reference method.Detailed results of the POD analyses are presented in Tables 9
8
and 13.
9
10
Romaine lettuce (25 g)
11
12
For the low inoculation level of the MDA2 -
Listeria monocytogenes
assay, there were 7
13
presumptive positives and 7 confirmed positives following the FDA/BAM Chapter 10 reference
14
method confirmation procedure. There were 6 observed positives for the reference method. For
15
the high inoculation level, there were 5 presumptive positives and 5 confirmed positives
16
following the FDA/BAM Chapter 10 reference method confirmation procedure. There were 5
17
confirmed positives following the reference method.Detailed results of the POD analyses are
18
presented in Tables 10 and 14.
19
20
Queso Fresco (25 g)
21
22
For the low inoculation level of the MDA2 –
Listeriamonocytogenes
assay, there were 11
23
presumptive positives and 11 confirmed positives following the AOAC 993.12 reference method
24
confirmation procedure. There were 9 observed positives for the reference method. For the high
25
inoculation level, there were 5 presumptive positives and 5 confirmed positives following the
26
AOAC 993.12 reference method confirmation procedure. There were 5 confirmed positives
27
following the reference method.Detailed results of the POD analyses are presented in Tables 10
28
and 14.
29
30
4%Milk Fat Cottage Cheese (25 g)
31
32
For the low inoculation level of the MDA2 -
Listeria monocytogenes
assay, there were 10
33
presumptive positives and 10 confirmed positives following the AOAC 993.12 reference method
34
confirmation procedure. There were 8 observed positives for the reference method. For the high
35
inoculation level, there were 5 presumptive positives and 5 confirmed positives following the
36
AOAC 993.12 reference method confirmation procedure. There were 5 confirmed positives
37
following the reference method.Detailed results of the POD analyses are presented in Tables 10
38
and 14.
39
40
3% Chocolate Whole Milk (25 mL)
41
42
For the low inoculation level of the MDA2 -
Listeria monocytogenes
assay, there were 9
43
presumptive positives and 9 confirmed positives following the AOAC 993.12 reference method
44
confirmation procedure. There were 6 observed positives for the reference method. For the high
45
inoculation level, there were 5 presumptive positives and 5 confirmed positives following the
46