AOAC-RI ERP Book MICRO Sept 2016.pdf

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

3M Petrifilm SALX Method

Confirmed

Presumptive positive test portions on 3M SALX Plates

Confirmed positive by 3M Confirmation Disk

X 2 Alternative Confirmation

X 2 Traditional Confirmation

Reference Method

Total Samples

Inoculation Level

Inoculating Organism

APC CFU/25g 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. Saintpaul

1.0 x 10 7

20

7

7

11

10

0.9

0.2-2 CFU/

0.77

Test Portion ATCC 9712

(0.41-1.36)

18 Hr Primary Enrichment – 24 Hr RV-R10 2 0 Enrichment

Control

< 0.075

N/A

5

0

0

0

0

-

S. enterica ser. Saintpaul

1.0 x 10 7

20

11

11

11

10

0.1

0.2-2 CFU/

0.77

Test Portion ATCC 9712

(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. Saintpaul

1.0 x 10 7

20

7

7

11

10

0.9

0.2-2 CFU/

0.77

Test Portion ATCC 9712

(0.41-1.36)

24Hr Primary Enrichment – 24 Hr RV-R10 2 0 Enrichment

Control

N/A

< 0.075

5

0

0

0

0

-

S. enterica ser. Saintpaul

1.0 x 10 7

20

11

11

11

10

0.1

0.2-2 CFU/

0.77

Test Portion ATCC 9712

(0.41-1.36)

2 3

*Includes 95% confidence intervals