AOAC-RI ERP Book MICRO Sept 2016.pdf
Document 2 of 2 – 3M Petrifilm Salmonella Express PTM Study Report
Table 18. 3M Petrifilm SALX Method Comparison Chi-Square Results for Cooked Chicken Nuggets vs USDA (Internal Data) 1
3M Petrifilm SALX Method
Confirmed positive by 3M Confirmation Disk
Presumptive positive test portions on 3M SALX Plates
X 2 Alternative Confirmation
X 2 Traditional Conformation
Inoculation Level
Inoculating Organism
APC CFU/g MPN/25g*
Total Samples
USDA/FSIS- MLG
18 Hr Primary Enrichment
Control
N/A
< 0.075
5
0
0
0
-
-
S. enterica ser. Typhimuriu m
2.4 x 10 2
20
6
6
6
0
0
0.2-2 CFU/
0.03
ATCC 14028
Test Portion
(0.01-0.08)
24 Hr Primary Enrichment
Control
N/A
< 0.075
-
5
0
0
0
-
S. enterica ser. Typhimuriu m
2.4 x 10 2
20
6
6
6
0
0
0.2-2 CFU/
0.03
ATCC 14028
Test Portion
(0.01-0.08)
2 3 4 5 6 7 8 9
*Includes 95% confidence intervals
10 11 12
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