TABLE 4.
Results of repeated sampling passes and final wash solution by surface material and sampling method
| Surface | Parameter | Result for:
|
|||||
|---|---|---|---|---|---|---|---|
| Swab
|
Wipe
|
Vacuum
|
|||||
| Mean | CV | Mean | CV | Mean | CV | ||
| Steel | No. of reference plates | 16 | 16 | 16 | |||
| Reference agar (CFU/100 cm2)a | NAd | 250 | 22 | NA | |||
| No. of samplesb | 8 | 9 | 5 | ||||
| 100% × P1/(P1 + P2 + P3 + W)c | 87 | 11 | 95 | 2.9 | 88 | 2.8 | |
| 100% × P2/(P1 + P2 + P3+ W) | 5.4 | 68 | 2.7 | 68 | 5.3 | 34 | |
| 100% × P3/(P1 + P2 + P3+ W) | 4.6 | 170 | 1.9 | 83 | 1.2 | 61 | |
| 100% × W/(P1 + P2 + P3+ W) | 2.7 | 130 | 0.3 | 110 | 5.4 | 31 | |
| 100% × (P1 + P2 + P3 + W)/A | NA | 20 | 48 | NA | |||
| Carpet | No. of reference plates | 12 | 12 | 12 | |||
| Reference agar (CFU/100 cm2) | 250 | 15 | 250 | 15 | 250 | 15 | |
| No. of samples | 8 | 6 | 6 | ||||
| 100% × P1/(P1 + P2 + P3 + W) | 8.9 | 37 | 20 | 15 | 26 | 64 | |
| 100% × P2/(P1 + P2 + P3 + W) | 2.9 | 61 | 9.4 | 10 | 2.7 | 61 | |
| 100% × P3/(P1 + P2 + P3 + W) | 2.7 | 33 | 6.6 | 28 | 1.4 | 130 | |
| 100% × W/(P1 + P2 + P3 + W) | 86 | 5.7 | 64 | 4.5 | 70 | 26 | |
| 100% × (P1 + P2+ P3 + W)/A | 112 | 19 | 63 | 9.6 | 13 | 66 | |
a
Reference agar samples for steel-swab and steel-vacuum combinations were not available for the repeated sampling pass experiment.
b
Steel-wipe combination results exclude a single sample because the sample was lost. Steel-vacuum combination results exclude a single sample because the tool to move the shelves was dropped, resulting in one of the samples not being opened prior to settling.
c
Pi is the result from sampling pass i (where i = 1, 2, or 3); W is the result from the final wash solution; and A is the mean agar result for the run.
d
NA, not applicable.