ERP Micro December 2019

bioMérieux GENE-UP® Listeria species 2 (LIS 2) AOAC ® Certification Number 121803

0.00, 0.43 0.22, 0.61 0.57, 1.00

-

5

0

0.00

0.00, 0.43

0

0.00

0.00

-0.43, 0.43

Bagged lettuce (25 g)

0.63 (0.35, 1.04)

22 Hours

20 12

0.60

0.39, 0.78

8

0.40

0.20

-0.10, 0.45

L. seelegeri

>10 (2, >10)

5

5

1.00

0.57, 1.00

5

1.00

0.00

-0.43, 0.43

Candidate

Reference

Matrix/Test Portion

Time Point

CFU h / Test Portion

Strain

N b

dPOD C f

95% CI g

x c POD C d

95% CI

X

POD R e

95% CI

0.00, 0.43 0.34, 0.74 0.57, 1.00

-

5

0

0.00

0.00, 0.43

0

0.00

0.00

-0.43, 0.43

Smoked salmon (125 g)

L. mono. ATCC 35152

0.74 (0.43, 1.23)

24 Hours

0.15

-0.14, 0.41

20 14

0.70

0.48, 0.85 11

0.55

>10 (2, >10)

5

5

1.00

0.57, 1.00

5

1.00

0.00

-0.43, 0.43

Candidate

Reference

Matrix/Test Portion

Time Point

CFU h / Test Portion

Strain

N b

dPOD C f

95% CI g

x c POD C d

POD R e

95% CI

0.00, 0.43 0.18, 0.57 0.57, 1.00

0.00, 0.43 0.08, 0.42 0.57, 1.00

-

5

0

0.00

0

0.00

0.00

-0.43, 0.43

L. mono. ATCC 751

Stainless Steel (4” x 4”)

18 Hours

25 & 90

20

7

0.35

4

0.20

0.15

-0.12, 0.40

& E. faecalis ATCC 29212

1250 & 4500

5

5

1.00

5

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 C = Candidate method confirmed positive outcomes divided by the total number of trials e POD R = Reference method confirmed positive outcomes divided by the total number of trials f dPOD C = Difference between the confirmed candidate method result and reference 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 h CFU/Test Area = Results of the CFU/Test area were determined by plating the inoculum for each matrix in triplicate

Table 7. INTERNAL LABORATORY - GENE-UP ™ Listeria species Assay, Presumptive vs. Confirmed – POD Results (4)

Presumptive

Confirmed

Matrix/ Test Portion

MPN a / Test Portion

Time Point

Strain

N b

dPOD CP f

95% CI g

x c

POD CP d

95% CI

X

POD CC e

95% CI

0.00, 0.43 0.30, 0.70 0.57, 1.00

0.00, 0.43 0.30, 0.70 0.57, 1.00

-0.43, 0.43 -0.28, 0.28 -0.43, 0.43

-

5

0

0.00

0

0.00

0.00

L. seeligeri ATCC 35967

Deli ham (25 g)

22 Hours

0.87 (0.51, 1.43) 20 10

0.50

10

0.50

0.00

>10 (2, >10)

5

5

1.00

5

1.00

0.00

Presumptive

Confirmed

Matrix/ Test Portion

MPN a / Test Portion

Time Point

Strain

N b

dPOD CP f

95% CI g

x c

POD CP d

95% CI

X

POD CC e

95% CI