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Document 2 of 2 – 3M Petrifilm Salmonella Express PTM Study Report
Table 15. 3M Petrifilm SALX Method Comparison Chi-Square Results for Spinach vs BAM (Internal Data)
1
Confirmed
positive by 3M
Confirmation
Disk
Reference
Method
Control
N/A
< 0.075
5
0
0
0
0
-
0.2-2 CFU/
S. enterica
ser.
Saintpaul
0.77
Test Portion ATCC 9712
(0.41-1.36)
Control
N/A
< 0.075
5
0
0
0
0
-
0.2-2 CFU/
S. enterica
ser.
Saintpaul
0.77
Test Portion ATCC 9712
(0.41-1.36)
Control
N/A
< 0.075
5
0
0
0
0
-
0.2-2 CFU/
S. enterica
ser.
Saintpaul
0.77
Test Portion ATCC 9712
(0.41-1.36)
Control
N/A
< 0.075
5
0
0
0
0
-
0.2-2 CFU/
S. enterica
ser.
Saintpaul
0.77
Test Portion ATCC 9712
(0.41-1.36)
Presumptive
positive test
portions on
3M SALX
Plates
Confirmed
18 Hr Primary Enrichment – 8 Hr RV-R10 2
0
Enrichment
Inoculation
Level
Inoculating
Organism
APC
CFU/25g MPN/25g*
Total
Samples
3M Petrifilm SALX Method
10
0.9
FDA/BAM
X
2
Alternative
Confirmation
X
2
Traditional
Confirmation
1.0 x 10
7
20
7
7
11
18 Hr Primary Enrichment – 24 Hr RV-R10 2
0
Enrichment
1.0 x 10
7
20
11
11
11
10
0.1
24 Hr Primary Enrichment – 8 Hr RV-R10 2
0
Enrichment
1.0 x 10
7
20
7
7
11
10
0.9
24Hr Primary Enrichment – 24 Hr RV-R10 2
0
Enrichment
1.0 x 10
7
20
11
11
11
10
0.1
2
*Includes 95% confidence intervals
3