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Bird et al.: Journal of AOAC International Vol. 98, No. 4, 2015 989
Table 3. Individual collaborator results for full-fat cottage cheese (4% milk fat)
a
High-level test portions
Low-level test portions
Uninoculated test portions
Lab
1 2 3 4 5 6 7 8 9 10 11 12
1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12
3M MDA
Listeria monocytogenes
1
+ + + + + + + + + + + + –
b
+ + – – + + – – – + –
– – – – – – – – – – – –
2
+ + + + + + + + + + + +
+ – – + + + – – – + + + – – – – – – – – – – – –
3
+ + + + + + + + + + + + –
b
– – – – + + + + + + + – – – – – – – – – – – –
4 c
NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
5 c
NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
6 c
+ + + + + + + + + + + + +
d
+
d
+
d
+
d
+ + + + + +
d
+ + +
d
+
d
+
d
+
d
+ +
d
+ d
+ d
+ d
+
d
+
d
+
d
7
+ + + + + + + + + + + +
– – + – – – – – – + + + – – – – – – – – – – – –
8
+ + + + + + + + + + + +
+ + + + – + – – – – + +
d
– – – – – – – – – – – –
9
+ + + + + + + + + + + +
+ + – – – + + – – – – –
– – – – – – – – – – – –
10
+ + + + + + + + + + + +
– – – – + – + + – + + + – – – – – – – – – – – –
11
+ + + + + + + + + + + +
– – – + + + + – – – + + – – – – – – – – – – – –
b
12
+ + +
d
+ + + + + + + + +
+ + + + + – + – – – – –
– – – – – – – – – – – –
13
c
+ + + + + + + +
d
+
d
+ + +
+ – + +
d
+
d
+
d
– – – – + + – – – – – – – – – – – –
14
+ + + + + + + + + + + +
+ + – – + + + – – – – + – – – – – – – – – – – –
15
+ + + + + +
d
+
d
+ + + + +
+ – + + + + – + – – + –
– – – – – – – – – – – –
16
NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
AOAC OMA
993.12
1
+ + + + + + + + + + + +
– – – – + + – + – + + + – – – – – – – – – – – –
2
+ + + + + + + + + + + +
+ + + – + + + – – – – + – – – – – – – – – – – –
3
+ + + + + + + + + + + +
– + + + – – – + + + + –
– – – – – – – – – – – –
4 c
NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
5 c
NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
6 c
+ + + + + – + – – + – –
– – – – – – + + – – – –
– – – – – – – – – – – –
7
+ + + + + + + + + + + +
– + + + + + + + + – + + – – – – – – – – – – – –
8
+ + + + + + + + + + + +
+ – + + + – – + – + – + – – – – – – – – – – – –
9
+ + + + + + + + + + + +
– – + + – – + + + + + + – – – – – – – – – – – –
10
+ + + + + + + + + + + +
+ – – – + + + + + + – –
– – – – – – – – – – – –
11
+ + + + + + + + + + + +
– – – + – – – + + – + + – – – – – – – – – – – –
12
+ + + + + + + + + + + +
– + – + – – + – – + – + – – – – – – – – – – – –
13
c
+ + + + + + + + + + + +
– + + + – + – + + + – –
– – – – – – – – – – – –
14
+ + + + + + + + + + + +
+ + – – – + + + – – – + – – – – – – – – – – – –
15
+ + + + + + + + + + + +
– + – – – – + + + – – + – – – – – – – – – – – –
16
NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
a+ =
L. monocytogenes
were detected in samples; – =
L. monocytogenes
were not detected in sample; NA = Laboratory did not participate in this matrix or results were not received.
bSample was presumptive positive on 3M MDA
Listeria monocytogenes
but confirmed negative indicating a false-positive result.
cResults were not used in statistical analysis due to laboratory error.dSample was presumptive negative on 3M MDA
Listeria monocytogenes
but confirmed positive indicating a false-negative result.