AOAC-RI ERP Book MICRO Sept 2016.pdf

Document 2 of 2 – 3M Petrifilm Salmonella Express PTM Study Report

Table 12. 3M Petrifilm SALX Method Comparison Chi-Square Results for Raw Ground Beef vs USDA (Internal Data) 1

3M Petrifilm SALX Method

Presumptive positive test portions on 3M Petrifilm SLAX Plates

SALX Confirmation Disk Positive

X 2 Alternative Confirmation

X 2 Traditional Conformation

Inoculation Level

Inoculating Organism

APC CFU/g MPN/25g*

Total Samples

USDA/FSIS- MLG

18 Hr Primary Enrichment – 8 Hr 2 0 RV-R10 Enrichment

Control

N/A

< 0.075

5

0

0

0

-

-

S. enterica ser. Ohio

1.07

3.4 x 10 6

0.2-2 CFU/

20

13

13

13

0

0

(0.65-1.79)

Test Portion STS 81

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

Control

N/A

< 0.075

5

0

0

0

-

-

S. enterica ser. Ohio

1.07

3.4 x 10 6

0.2-2 CFU/

20

13

13

13

0

0

(0.65-1.79)

Test Portion

STS 81

24 Hr Primary Enrichment – 8 Hr 2 0 RV-R10 Enrichment

Control

N/A

< 0.075

5

0

0

0

-

-

S. enterica ser. Ohio

1.07

3.4 x 10 6

0.2-2 CFU/

20

13

13

13

0

0

(0.65-1.79)

Test Portion STS 81

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

Control

N/A

< 0.075

5

0

0

0

-

-

S. enterica ser. Ohio

1.07

3.4 x 10 6

0.2-2 CFU/

20

13

13

13

0

0

(0.65-1.79)

Test Portion STS 81

2 3

*Includes 95% confidence interval