AOAC-RI ERP Book MICRO Sept 2016.pdf

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

Table 19. 3M Petrifilm SALX Method Comparison Chi-Square Results for Stainless Steel vs BAM (Internal Data) 1

Confirmed 3M Petrifilm SALX Method

Confirmed positive by 3M Confirmation Disk

Presumptive positive test portions on 3M SALX Plates

X 2 Alternative Confirmation

X 2 Traditional Conformation

CFU/ 100cm 2 *

Reference Method

Inoculation Level

Inoculating Organism

APC CFU/g

Total Samples

FDA/BAM

18 Hr Primary Enrichment

Control

N/A

0

5

0

0

0

0

-

S. enterica ser. Kahla

NA

0.2-2 CFU/

51

20

6

6

6

7

0.11

0.11

ATCC 17980

Test Portion

24 Hr Primary Enrichment

Control

N/A

0

5

0

0

0

0

-

S. enterica ser. Kahla

NA

0.2-2 CFU/

51

20

6

6

6

7

0.11

0.11

ATCC 17980

Test Portion

2 3 4 5 6 7 8 9

Includes 95% confidence intervals

10 11 12 13 14 15