AOAC-RI ERP Book MICRO Sept 2016.pdf
Document 2 of 2 – 3M Petrifilm Salmonella Express PTM Study Report
Table 14. 3M Petrifilm SALX Method Comparison Chi-Square Results for Uncooked Frozen Shrimp vs BAM (Internal Data) 1
3M Petrifilm SALX Method
Confirmed
Confirmed positive by 3M Confirmation Disk
Presumptive positive test portions on 3M SALX Plates
X 2 Traditional Confirmation
X 2 Alternative Confirmation
Reference Method
Inoculation Level
Inoculating Organism
APC cfu/g
Total Samples
MPN/25g*
FDA/BAM
18 Hr Primary Enrichment – 8 Hr RV-R10 2 0 Enrichment
Control
N/A
< 0.075
5
0
0
0
0
-
S. enterica ser. Virchow
4.0 x 10 4
20
12
12
12
10
0.39
0.2-2 CFU/
0.77
ATCC 51955
Test Portion
(0.41-1.36)
18 Hr Primary Enrichment – 24 Hr RV-R10 2 0 Enrichment
Control
N/A
< 0.075
5
0
0
0
0
-
S. enterica ser. Virchow
4.0 x 10 4
20
12
12
12
10
0.39
0.2-2 CFU/
0.77
ATCC 51955
Test Portion
(0.41-1.36)
24 Hr Primary Enrichment – 8 Hr RV-R10 2 0 Enrichment
Control
N/A
< 0.075
5
0
0
0
0
-
S. enterica ser. Virchow
4.0 x 10 4
20
12
12
12
10
0.39
0.2-2 CFU/
0.77
ATCC 51955
Test Portion
(0.41-1.36)
24 Hr Primary Enrichment – 24 Hr RV-R10 2 0 Enrichment
Control
N/A
< 0.075
5
0
0
0
0
-
S. enterica ser. Virchow
4.0 x 10 4
20
12
12
12
10
0.39
0.2-2 CFU/
0.77
ATCC 51955
Test Portion
(0.41-1.36)
2 3
*Includes 95% confidence intervals
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