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Table I.
Expression of virulence of 16 L. monocytogenes strains and their VBNC forms, by formation of plaques in the human adenocarcinoma cell line HT-29. The results are expressed as the number of plaques obtained for 7 log CFU deposited per well.
Strain | Source | Virulence (mean log + SD) culturable strains | Virulence (mean log + SD) VBNC |
---|---|---|---|
EGDea (control) | Reference strain | 5.23 ± 0.40 | ND |
Scott A | Reference strain | 6.38 ± 0.03 | 0 |
EGDeb | Reference strain | 5.18 ± 0.11 | 0 |
L1069 | Patient | 5.75 ± 0.34 | 0 |
L1371 | Patient | 5.18 ± 0.27 | 0 |
L1372 | Patient | 6.70 ± 0.13 | 0 |
L3365 | Patient | 6.18 ± 0.47 | 0 |
L3368 | Patient | 5.35 ± 0.23 | 0 |
L3371 | Patient | 5.66 ± 0.14 | 0 |
L839 | Salmon | 5.44 ± 0.37 | 0 |
L1272 | Salmon | 5.81 ± 0.26 | 0 |
L1338c | Salmon | 4.28 ± 0.24 | 0 |
L2663 | Salmon | 4.98 ± 0.16 | 0 |
L2735 | Salmon | 5.56 ± 0.21 | 0 |
L1317 | Drainpipe | 4.88 ± 0.27 | 0 |
L2842 | Salmon waste | 5.61 ± 0.31 | 0 |
L1232 | Seawater | 5.88 ± 0.13 | 0 |