352 / 363
450
C
rowley
et al
.
:
J
ournal of
AOAC I
nternational
V
ol
. 97, N
o
. 2, 2014
Table 3. Individual collaborator results for queso fresco
a
(25 g test portions)
VIDAS LMX
b
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
1 + + + + + + + + + + + + + + – + – + – + – + – – – – – – – – – – – – – –
2 + + + + + + + + + + + + + + – + + – – – – – – – – – – – – – – – – – – –
3 + + + + + + + + + + + + + – + – + + + + + + – – – – – – – – – – – – – –
4 + + + + + + + + + + + + + + – – – – – + – –
c
–
c
– – – – – – – – – – – –
5 + + + + + + + + + + + + – – + – + + + – – – + – – – – – – – – – – – – –
6 + + + + + + + + + + + + + – – + + + – – – + + – – – – – – – – – – – – –
7 + + + + + + + + + + + + + + – – + – – + + + – – – – – – – – – – – – – –
8 + + + + + + + + + + + + – + – + + + – – – – + + – – – – – – – – – – – –
9 + + + + + + + + + + + + – + + + – – – – – + + – – – – – – – – – – – – –
10 + + + + + + + + + + + + + + – + + – – – – + + – – – – – – – – – – – – –
11
d
+ + + + + + + + + + + + + + +
e
+ – – – +
f
+ – – – – – – – – – – – +
e
– – +
e
12 + + + + + + + + + + + + – – + + + – – + + – + + – – – – – – – – – – – –
13 + + + + + + + + + + + + – – – + + + – + + + – + – – – – – – – – – – – –
14 + + + + + + + + + + + + + – + – + – – + – + – + – – – – – – – – – – – –
AOAC
993.12
1 + + + + + + + + + + + + – – + – – + + + + + – – – – – – – – – – – – – –
2 + + + + + + + + + + + + – + – – – – – + + + – + – – – – – – – – – – – –
3 + + + + + + + + + + + + – + – – – + + + + + – + – – – – – – – – – – – –
4 + + + + + + + + + – + + – – + – – – + + – – + – – – – – – – – – – – – –
5 + + + + + + + + + + + + + – – – + + + – + + – – – – – – – – – – – – – –
6 + + + + + + + + + + – – – + – + + – – + + – + + – – – – – – – – – – – –
7 + + + + + + + + + + + + – – – – – – + + + – – + – – – – – – – – – – – –
8 + + + + + + + + + + + + – + – + + + – – – – + – – – – – – – – – – – – –
9 + + + + + + + + + + + + – – + + – + – – – + – – – – – – – – – – – – – –
10 + + + + + + + + + + + + – + + + – – – – – – – + – – – – – – – – – – – –
11
d
+ + + + + + + + + + + + + +
g
+
g
+ +
h
+ + +
i
+ + – +
h
– +
h
– – – +
h
– – +
j
– – –
12 + + + + + + + + + + + + – + – – + – – – + + – + – – – – – – – – – – – –
13 + + + + + + + + + + + + + + + + – + – – – – + + – – – – – – – – – – – –
14 + + + + + + + + + + + + – + – + – + – – + + – – – – – – – – – – – – – –
a
+ =
Listeria
spp. were detected in samples; – =
Listeria
spp. were not detected in sample.
b
Confirmed results from OXA and ALOA were identical for each test portion.
c
Sample was presumptive positive on VIDAS LMX and confirmed negative.
d
Results were not used in statistical analysis.
e
Sample presumptive negative on VIDAS LMX, result was reported positive as
L. seeligeri
.
f
Sample was presumptive positive on VIDAS LMX but result was reported positive as
L. welshimeri
.
g
Result was reported positive as
L. innocua
.
h
Result was reported positive as
L. ivanovii
.
i
Result was reported positive as
L. grayi
.
j
Sample confirmed positive as
L. monocytogenes
.
Candidates for 2016 Method of the Year
351