Table 1.
Detection of Listeria in 2460 salads and sandwiches sampled in hospitals and produced by Company X
| Number of samples tested (%) | |||||
|---|---|---|---|---|---|
| 2016 | 2017 Jan–June | 2017 July–Dec | 2018 | 2019 | |
| Salads (finished products) n = 1104 | |||||
| L. monocytogenes detected | 5 (10%)a | 31 (31%)b | 26 (11%) | 11 (2%) | 1 (0.3%) |
| Listeria species (not L. monocytogenes) detected | 6 (11%)a | 5 (5%) | 25 (11%)c | 66 (15%) | 10 (4%) |
| Listeria not detected | 45 (86%) | 65 (64%) | 179 (78%) | 367 (83%) | 266 (96%) |
| Total tested | 52 | 101 | 230 | 444 | 277 |
| Sandwiches (finished products) n = 1356 | |||||
| L. monocytogenes detected | 3 (3%)d | 0 | 3 (1%) | 5 (1%) | 0 |
| Listeria species (not L. monocytogenes) detected | 7 (6%)d | 1 (1%) | 7 (3%) | 21 (4%) | 4 (1%) |
| Listeria not detected | 106 (93%) | 103 (99%) | 228 (96%) | 471 (95%) | 399 (99%) |
| Total tested | 114 | 104 | 238 | 497 | 403 |
a
Four samples L. monocytogenes detected together with L. innocua (three samples) or L. seeligeri (one sample).
All Listeria detected at <20 cfu/g except for: bL. monocytogenes was detected at 20 cfu/g in one sample of quiche lorraine salad; cL. innocua was detected at 20 cfu/g in one sample of corned beef salad.
d
One sample L. monocytogenes detected together with L. innocua.