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Table 4. BAX® System Presumptive vs. Confirmed Results – Meat and Seafood
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
Raw ground beef with
soy (25 g)
BPW
Control
5
0
0
(0, 0.43)
0
0
(0, 0.43)
0
(-0.45, 0.45)
0.94 (0.68, 1.3)
60
36
0.60
(0.47, 0.71) 36
0.60
(0.47, 0.71)
0
(-0.049, 0.049)
8.6 (6.2, 12)
5
5
1.0
(0.57, 1.0)
5
1.0
(0.57, 1.0)
0
(-0.45, 0.45)
Raw ground beef with
soy (325 g)
mTSB+caa+n
Control
5
0
0
(0, 0.43)
0
0
(0, 0.43)
0
(-0.45, 0.45)
0.94 (0.68, 1.3)
60
39
0.65
(0.52, 0.76) 39
0.65
(0.52, 0.76)
0
(-0.049, 0.049)
8.6 (6.2, 12)
5
5
1.0
(0.57, 1.0)
5
1.0
(0.57, 1.0)
0
(-0.45, 0.45)
Beef trim (25 g)
BPW
Control
5
0
0
(0-0.43)
0
0
(0, 0.43)
0
(-0.45, 0.45)
0.85 (0.50, 1.4)
20
7
0.35
(0.18-0.57)
7
0.35
(0.18, 0.57)
0
(-0.14, 0.14)
4.3 (2.7, 7.0)
5
5
1.0
(0.57-1.0)
5
1.0
(0.57, 1.0)
0
(-0.45, 0.45)
Beef trim (325 g)
MP media
Control
5
0
0
(0-0.43)
0
0
(0, 0.43)
0
(-0.45, 0.45)
0.85 (0.50, 1.4)
20
10
0.50
(0.30, 0.70) 10
0.50
(0.30, 0.70)
0
(-0.14, 0.14)
4.3 (2.7, 7.0)
5
5
1.0
(0.57-1.0)
5
1.0
(0.57, 1.0)
0
(-0.45, 0.45)
Frankfurters (325 g)
BPW
Control
5
0
0
(0, 0.43)
0
0
(0, 0.43)
0
(-0.45, 0.45)
0.46 (0.23, 0.93)
20
10
0.50
(0.30, 0.70) 10
0.50
(0.30, 0.70)
0
(-0.14, 0.14)
3.2 (1.6, 6.5)
5
5
1.0
(0.57, 1.0)
5
1.0
(0.57, 1.0)
0
(-0.45, 0.45)
Shrimp (25 g)
LB
Control
5
0
0
(0, 0.43)
0
0
(0-0.43)
0
(-0.45, 0.45)
0.71 (0.40, 1.2)
20
11
0.55
(0.34-0.74) 11
0.55
(0.34, 0.74)
0
(-0.14, 0.14)
2.5 (1.5, 4.2)
5
4
0.80
(0.38, 1.0)
4
0.80
(0.38, 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)
2
b
X = Number of positive test portions
3
c
POD
CP
=
Candidate method presumptive positive outcomes divided by the total number of trials
4
d
POD
CC
= Candidate method confirmed positive outcomes divided by the total number of trials
5
e
dPOD
CP
= Difference between the candidate method presumptive result and candidate method confirmed result POD values
6
f
95% CI = If the confidence interval of a dPOD does not contain zero, then the difference is statistically significant at the 5% level
7
8
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