Biomedical Engineering Reference
In-Depth Information
Table 5.1
L. monocytogenes
prevalence across different sites in the retail deli (adapted from
Hoelzer et al.
2011b
)
Percent positive samples
(95 % CI)
a
Total
positives
Total samples
tested
Sample location
Food of food contact surfaces
Product (food)
1.5
(0.6-3.1)
7
462
Slicer
2.7
(0.9-6.3)
5
183
Utensils (bowl, cutting board, others)
4.2
(2.2-7.0)
13
314
Bowl
b
4.8
(0.6-16.2)
2
42
Cutting board
b
7.1
(3.3-13.1)
9
127
Other utensils (e.g., knife, spoon,
tongs)
b
1.4
(0.2-4.9)
2
145
Multiple food contact areas (e.g.,
cutting board)
5.9
(0.7-19.7)
2
34
Deli case
6.9
(4.1-10.9)
17
246
Raw meat/seafood display
9.1
(0.2-41.3)
1
11
Subtotal
3.6
(2.6-4.8)
45
1,250
Non-food contact surfaces
Sink
13.5
(9.5-18.3)
34
252
Dairy case
13.6
(9.5-18.6)
32
236
Floor/drains
27.4
(23.8-31.1)
163
596
Deli area drain/fl oor
c
16.1
(10.5-23.2)
23
143
Raw meat preparation area
drain/fl oor
c
39.4
(31.7-47.7)
60
152
Seafood area drain/fl oor
c
25
(13.2-40.3)
11
44
Produce area drain/fl oor
c
24
(15.8-33.8)
23
96
Walk in cooler drain/fl oor
c,d
34
(25.2-43.6)
37
109
Other drain/fl oor areas
c
17
(8.1-29.8)
9
53
Floor in dry aisle
7.9
(4.8-12.2)
18
228
Floor adjacent to entrance
13.9
(8.3-21.4)
17
f
122
Walk in cooler
20.6
(15.3-26.7)
43
209
Walk in cooler shelves
6.1
(2.3-12.9)
6
98
Walk in cooler door handle
0
(0.0-84. 2)
0
2
Walk in cooler drain (K1)/fl oor
(K2
c
)
34
(25.2-43.6)
37
109
Cart wheels
7. 6
(3.5-13.9)
9
119
Produce preparation area
10.5
(1.3-33.1)
2
19
Milk crates
34.3
(19.1-52.2)
12
35
Miscellaneous areas (e.g., shopping
baskets, icemaker, etc.)
0
(0.00-15.4)
0
23
Subtotal
17
(15.2-18.8)
293
1,731
a
Exact binominal confi dence interval
b
Individual subcategories that are part of “utensils”
c
Individual subcategories that are part of “fl oor/drain”
d
Results shown twice, as subcategory of “fl oor/drain” and of “walk-in cooler”
