AOAC ERP MICRO AUGUST 2018

OMAMAN-31 E: AOAC RI PTM Report 091501 ERP Use Only - March 2016

f dPOD CP = Difference between the candidate method presumptive result and candidate method confirmed result POD values g 95% CI = If the confidence interval of a dPOD does not contain zero, then the difference is statistically significant at the 5% level

Table 22: 3M ™ MDA 2 Salmonella Assay, Presumptive vs. Confirmed – POD Results

Analysi s Time Point

Presumptive

Confirmed

MPN a / Test Portion

Matrix/Tes t Portion Pasteurized Processed American Cheese (25 g)

N b

f 95% CI g

Strain

dPOD CP

x c

d 95% CI

e 95% CI

POD CP

X

POD CC

-

5

0

0.00 0.45

0.00, 0.43 0.26, 0.66

0 9

0.00 0.45

0.00, 0.43 0.00 0.26, 0.66 0.00

-0.43, 0.43 -0.28, 0.28

Salmonella Montevideo ATCC 8387

0.61 (0.33, 1.02) 3.01 (1.31, 6.89)

18 Hours

20 9

5

5

1.00

0.57, 1.00

5

1.00

0.57, 1.00 0.00

-0.43, 0.43

a MPN = Most Probable Number is calculated using the LCF MPN calculator provided by AOAC RI, with 95% confidence interval b N = Number of test portions c x = Number of positive test portions d POD CP = Candidate method presumptive positive outcomes divided by the total number of trials e POD CC = Candidate method confirmed positive outcomes divided by the total number of trials f dPOD CP = Difference between the candidate method presumptive result and candidate method confirmed result POD values g 95% CI = If the confidence interval of a dPOD does not contain zero, then the difference is statistically significant at the 5% level

AOAC Research Institute Expert Review Panel Use Only