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VIDAS LPT - Summary 2012
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3.2.3 Conclusion
Following the dispatch of the samples to the 17 laboratories, the results are suitable for processing for 15
laboratories (exclusion of laboratories H and Q following the sample receipt conditions).
A third laboratory (F) was excluded from the interpretation of the results due to abnormal results.
3.3 Results of analyses
3.3.1 Total viable count
A sample of cottage cheese was supplied to all the laboratories in order to determine the total viable count (TVC).
The results are indicated in appendix D.
The counts obtained varied between 3.10
4
CFU/g and 8.10
8
CFU/g.
3.3.2 Results obtained by collaborating laboratories
The detailed
Listeria
detection results, for the 16 laboratories, are given in appendix D and are summarized below:
Positive results after confirmation obtained with the reference method
Contamination level
Laboratory
L0
L1
L2
Positive
results
Nb of
samples
Positive
results
Nb of
samples
Positive
results
Nb of
samples
A
0
8
0
8
7
8
B
0
8
3
8
7
8
C
0
8
2
8
6
8
D
0
8
1
8
8
8
E
0
8
2
8
8
8
G
0
8
2
8
8
8
I
0
8
8
8
8
8
J
0
8
5
8
8
8
K
0
8
1
8
8
8
L
0
8
8
8
8
8
M
0
8
8
8
8
8
N
0
8
8
8
8
8
O
0
8
8
8
8
8
P
0
8
8
8
8
8
Total
0
(a)
112
64
(b)
112
108
(c)
112
Positive results after confirmation obtained with the alternative method
Contamination level
Laboratory
L0
L1
L2
Positive
results
Nb of
samples
Positive
results
Nb of
samples
Positive
results
Nb of
samples
A
0
8
1
8
7
8
B
0
8
1
8
8
8
C
0
8
7
8
8
8
D
0
8
8
8
8
8
E
0
8
4
8
8
8
G
0
8
2
8
8
8
I
0
8
8
8
8
8
J
0
8
7
8
8
8
K
0
8
0
8
7
8
L
0
8
8
8
8
8
M
0
8
8
8
8
8
N
0
8
8
8
8
8
O
0
8
2
8
8
8
P
0
8
8
8
8
8
Total
0
(a)
112
72
(b)
112
110
(c)
112
(a) : false positive
(b) : true positive obtained at level 1
(c) : true positive obtained at level 2