264-265 / 453
39
1
Table 1. Individual Collaborator Results for Raw Ground Beef (73% Lean) – Manual Extraction
High Level Test Portions
Low Level Test Portions
Un-inoculated Test Portions
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
mericon
E. coliO157 Screen Plus
Lab
a
1
+
+
+ +
+
+ +
+
+ +
+
+
-
-
+
+
-
+
-
+
+
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
2
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
3
+
+
+ +
+
+ +
+
+ +
+
+
+
+
+
+
-
-
+
+
-
-
-
+
-
-
-
-
-
-
-
-
-
-
-
-
4
+
+
+ +
+
+ +
+
+ +
+
+
+ -
+
-
+
+
+
-
-
+
-
-
-
-
-
-
-
-
b
-
-
-
-
-
-
5
+
+
+ +
+
+ +
+
+ +
+
+
+
-
-
-
+
-
-
+
-
+
+
-
b
-
-
-
-
-
-
-
-
-
-
-
-
6
+
+
+ +
+
+ +
+
+ +
+
+
-
-
+ +
-
+
-
-
-
-
-
+
-
-
b
-
-
-
-
-
-
-
-
-
-
7
+
+
+ +
+
+ +
+
+ +
+
+
-
-
-
b
-
+
+
-
-
+
+ +
+
-
-
-
-
-
-
-
-
-
-
-
-
8
+
+
+ +
+
+ +
+
+ +
+
+
-
+
-
+
-
+
-
+ +
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
9
+
+
+ +
+
+ +
+
+ +
+
+
+
-
-
+
-
-
-
-
-
+ +
+
-
-
-
-
-
-
-
-
-
-
-
-
10
+
+
+ +
+
+ +
+
+ +
+
+
-
+ +
-
+
+ + -
b
-
+ +
+
-
-
-
b
-
-
-
-
-
-
-
-
-
11
+
+
+ +
+
+ +
+
+ +
+
+
-
-
+ + +
+
-
-
-
+ +
-
b
-
-
-
-
-
-
-
-
-
-
-
-
12
+
+
+ +
+
+ +
-
+ +
+
+
-
-
-
-
-
-
-
-
+
-
+
+
-
-
-
-
-
-
-
-
-
-
-
-
13
+
+
+ +
+
+ +
+
+ +
+
+
+ + + +
-
-
-
-
+
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
mericon
E. coliSTEC O-Type
Lab
a
1
+
+
+ +
+
+ +
+
+ +
+
+
-
-
+
+
-
+
-
+
+
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
2
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
3
+
+
+ +
+
+ +
+
+ +
+
+
+
+
+
+
-
-
+
+
-
-
-
+
-
-
-
-
-
-
-
-
-
-
-
-
4
+
+
+ +
+
+ +
+
+ +
+
+
+ -
+
-
+
+
+
-
-
+
-
-
-
-
-
-
-
-
-
-
-
-
-
-
5
+
+
+ +
+
+ +
+
+ +
+
+
+
-
-
-
+
-
-
+
-
+
+
-
-
-
-
-
-
-
-
-
-
-
-
-
6
+
+
+ +
+
+ +
+
+ +
+
+
-
-
+ +
-
+
-
-
-
-
-
+
-
-
-
-
-
-
-
-
-
-
-
-
7
+
+
+ +
+
+ +
+
+ +
+
+
-
-
-
-
+
+
-
-
+
+ +
+
-
-
-
-
-
-
-
-
-
-
-
-
8
+
+
+ +
+
+ +
+
+ +
+
+
-
+
-
+
-
+
-
+ +
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
9
+
+
+ +
+
+ +
+
+ +
+
+
+
-
-
+
-
-
-
-
-
+ +
+
-
-
-
-
-
-
-
-
-
-
-
-
10
+
+
+ +
+
+ +
+
+ +
+
+
-
+ +
-
+
+ +
-
-
+ +
+
-
-
-
-
-
-
-
-
-
-
-
-
11
+
+
+ +
+
+ +
+
+ +
+
+
-
-
+ + +
+
-
-
-
+ +
-
b
-
-
-
-
-
-
-
-
-
-
-
-
12
+
+
+ +
+
+ +
+
+ +
+
+
-
-
-
-
-
-
-
-
+
-
+
+
-
-
-
-
-
-
-
-
-
-
-
-
13
+
+
+ +
+
+ +
+
+ +
+
+
+ + + +
-
-
-
-
+
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
a
+=
E. coli
O157 was detected in samples; -=
E. coli
O157 was not detected in sample; n/a- lab did not participate or submit data for the matrix;
b
Sample was presumptive positive but confirmed negative indicating a false positive result;
OMAMAN-36 A : Collaborative Study Manuscript
For ERP Use Only
January 2017
AOAC Research Institute
Expert Review Panel Use Only