AOAC-RI ERP Book MICRO Sept 2016.pdf

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

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 MPN/325g*

Total Samples

FDA/BAM

18 Hr Primary Enrichment

Control

< 0.075

N/A

0

-

5

0

0

0

1.7 x 10 3

S. enterica ser. Poona

20

16

16

16

14

0.52

0.52

0.2-2 CFU/

0.03

Test Portion ATCC 4840

(0.01-0.68)

24 Hr Primary Enrichment

Control

N/A

< 0.075

0

0

0

-

5

0

1.7 x 10 3

S. enterica ser. Poona

20

16

16

16

14

0.52

0.52

0.2-2 CFU/

0.03

Test Portion ATCC 4840

(0.01-0.68)

2 3 4 5 6 7 8 9

*Includes 95% confidence intervals

10 11 12 13 14 15 16