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