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B ird et al .: J ournal of AOAC I nternational V ol . 100, N o . 2, 2017  459

Table 2016.08C. Comparative results for the detection of L. monocytogenes at three inoculum levels in 125 g deli turkey test portions by the 3M MDA 2 – L. monocytogenes method vs the USDA/FSIS MLG reference method in a collaborative study

Candidate presumptive

Candidate confirmed

Candidate result

Reference method

Candidate vs. reference

Presumptive vs. confirmed

n a

x b

Statistic Matrix Laboratory

POD CP n x

POD CC

POD C n x

POD R

dLPOD C

dLPOD CP

n

x

Uninoculated control

Deli turkey

1 2 3 4 5 6 7 8 9

12 0 0.00 12 0 12 0 0.00 12 0 12 0 0.00 12 0 12 0 0.00 12 0 12 0 0.00 12 0 12 0 0.00 12 0 12 0 0.00 12 0

0.00 12 0 0.00 12 0 0.00 0.00 12 0 0.00 12 0 0.00 0.00 12 0 0.00 12 0 0.00 0.00 12 0 0.00 12 0 0.00 0.00 12 0 0.00 12 0 0.00 0.00 12 0 0.00 12 0 0.00 0.00 12 0 0.00 12 0 0.00

0.00 0.00 0.00 0.00 0.00 0.00 0.00

0.00 0.00 0.00 0.00 0.00 0.00 0.00

NA c NA NA NA NA NA NA NA NA NA NA NA

NA

NA

12 0 0.00 12 0

0.00 12 0 0.00 12 0 0.00

0.00

0.00

10 NA NA NA NA NA NA NA NA NA NA NA NA

NA

NA

11 12 13 All

12 0 0.00 12 0 12 0 0.00 12 0 12 0 0.00 12 0 132 0 0.00 132 0

0.00 12 0 0.00 12 0 0.00 0.00 12 0 0.00 12 0 0.00 0.00 12 0 0.00 12 0 0.00 0.00 132 0 0.00 132 0 0.00

0.00 0.00 0.00 0.00

0.00 0.00 0.00 0.00

Estimate  LCL d  UCL e

0.00 0.03 0.00 0.00 0.16 0.00 0.00 0.16 0.00 0.00 0.23

0.00 0.03 0.00 0.00 0.16 0.00 0.00 0.16 0.00 0.00 0.23

0.00 0.03 0.00 0.00 0.16 0.00 0.00 0.16 0.00 0.00 0.23

0.00 0.03 0.00 0.00 0.16 0.00 0.00 0.16 0.00 0.00 0.23

−0.03

−0.03

0.03

0.03

s r

 LCL  UCL

s L

 LCL  UCL

s R

 UCL  LCL

1.0000

1.0000

1.0000

1.0000

P T

Low inoculum level

Deli turkey

1 2 3 4 5 6 7 12 7 0.58 12 7 12 7 0.58 12 6 12 4 0.33 12 4 12 5 0.42 12 5 12 6 0.50 12 6 12 8 0.66 12 7 12 7 0.58 12 7 ERP Use Only 0.58 12 7 0.58 12 6 0.50 0.50 12 6 0.50 12 5 0.42 0.33 12 4 0.33 12 5 0.42 0.42 12 5 0.42 12 4 0.33 0.50 12 6 0.50 12 6 0.50 0.58 12 7 0.58 12 6 0.50 0.58 12 7 0.58 12 6 0.50 0.08 0.08 0.00 0.08 0.00 0.00 0.00 0.00 0.00 −0.08 0.08 0.00 0.08 0.08

8 NA NA NA NA NA NA NA NA NA NA NA NA

NA

NA

0.66 12 8 0.66 12 6 0.50

0.16

0.00

9

12 8 0.66 12 8

10 NA NA NA NA NA NA NA NA NA NA NA NA

NA

NA

11 12 13

12 7 0.58 12 6 12 5 0.42 12 5 12 5 0.42 12 5

0.50 12 6 0.50 12 7 0.58 0.42 12 5 0.42 12 4 0.33 0.42 12 5 0.42 12 5 0.42

−0.08

0.08 0.00 0.00

0.08 0.00

MPN, CFU/test portion

Estimate 0.63

All 132 69 0.52 132 66 0.50 132 66 0.50 132 60 0.45

0.04

0.02

 LCL  UCL

0.49 0.80

0.43 0.61

0.41 0.59

0.41 0.59

0.37 0.54

−0.08

−0.10

0.17

0.15

04/05/2019