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Document 2 of 2 – 3M Petrifilm Salmonella Express PTM Study Report
Table 17. 3M Petrifilm SALX Method Comparison Chi-Square Results for Dry Dog Food 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.
Poona
0.03
Test Portion ATCC 4840
(0.01-0.68)
Control
N/A
< 0.075
5
0
0
0
0
-
0.2-2 CFU/
S. enterica
ser.
Poona
0.03
Test Portion ATCC 4840
(0.01-0.68)
Presumptive
positive test
portions on
3M SALX
Plates
Confirmed
18 Hr Primary Enrichment
Inoculation
Level
Inoculating
Organism
APC
CFU/g MPN/325g*
Total
Samples
3M Petrifilm SALX Method
14
0.52
0.52
FDA/BAM
X
2
Alternative
Confirmation
X
2
Traditional
Confirmation
1.7 x 10
3
20
16
16
16
24 Hr Primary Enrichment
1.7 x 10
3
20
16
16
16
14
0.52
0.52
2
*Includes 95% confidence intervals
3
4
5
6
7
8
9
10
11
12
13
14
15
16