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AOAC EXPERT REVIEW PANEL FOR MICROBIOLOGY FOR FOODS AND ENVIRONMENTAL SURFACES
AOAC Expert Review Panel Final Action Feedback
Table 5. BAX® System Presumptive vs. Confirmed Results – Poultry and EggPresented Data
Sample Type
Media
MPN
a
Test
Portions
BAX® Presumptive
BAX® Confirmed
dPOD
CP
e
95% CI
f
X
b
POD
CP
c
95% CI
f
X
b
POD
CC
d
95% CI
f
Ground turkey
(25 g)
BPW
Control
5
0
0
0
5
0
(0-0.43)
0
(-0.45, 0.45)
0.63 (0.40,
1.0)
20
8
0.40
(0.22,
0.61)
8
0.40
(0.22,
0.61)
0
(-0.14, 0.14)
3.7 (2.0, 9.6)
5
5
1.0
(0.57,
1.0)
5
1.0
(0.57,
1.0)
0
(-0.45, 0.45)
a
MPN = Most Probable Number based on the POD of reference method test
portions using the AOAC MPN calculator (with 95% confidence interval)
b
X = Number of positive test portions
c
POD
CP
=
Candidate method presumptive positive outcomes divided by the total
number of trials
d
POD
CC
= Candidate method confirmed positive outcomes divided by the total
number of trials
e
dPOD
CP
= Difference between the candidate method presumptive result and
candidate method confirmed result POD values
f
95% CI = If the confidence interval of a dPOD does not contain zero, then the
difference is statistically significant at the 5% level
Table 6. BAX® System vs. Reference Method Results – Poultry and EggPresented Data
Sample Type
Media
MPN
a
Test
Portions
BAX® Method
Reference Method
dPOD
C
e
95% CI
f
X
b
POD
C
c
95% CI
f
X
b
POD
CC
d
95% CI
f
Ground turkey
(25 g)
BPW
Control
5
0
0
(0, 0.43) 0
0
(0, 0.43)
0
(-0.45,
0.45)
0.63 (0.40,
1.0)
20
8
0.40
(0.22,
0.61)
8
0.40
(0.22,
0.61)
0
(-0.14,
0.14)
3.7 (2.0, 9.6)
5
5
1.0
(0.57,
1.0)
5
1.0
(0.57, 1.0)
0
(-0.45,
0.45)
a
MPN = Most Probable Number based on the POD of reference method test
portions using the AOAC MPN calculator (with 95% confidence interval)
b
X = Number of positive test portions
c
POD
C
=
Confirmed candidate method positive outcomes divided by the total
number of trials
d
POD
R
= Confirmed reference method positive outcomes divided by the total
number of trials
e
dPOD
C
= Difference between the candidate method and reference method POD
values
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