TABLE 2.
Growth of six Listeria monocytogenes strains and one Listeria innocua strain in brain heart infusion broth and in UVM I and II
| Species | Strain | Log cell density after 24 h (CFU/ml)
|
Generation time (h) in UVM Ic | ||
|---|---|---|---|---|---|
| BHIa | UVM Ia | UVM IIb | |||
| L. monocytogenes | La22 | 9.70 ± 0.15 | 7.59 ± 0.27 | 8.98 ± 0.19 | 1.06 ± 0.05a,b |
| Hu4239 | 9.76 ± 0.12 | 7.64 ± 0.20 | 8.62 ± 0.29 | 1.09 ± 0.03a,b | |
| V5a | 9.81 ± 0.05 | 7.21 ± 0.14 | 9.11 ± 0.04 | 1.18 ± 0.09b,c,d | |
| C1-056 | 9.80 ± 0.04 | 6.72 ± 0.71 | 8.97 ± 0.06 | 1.28 ± 0.15c,d,e | |
| V518a | 9.77 ± 0.10 | 7.78 ± 0.21 | 9.05 ± 0.01 | 1.05 ± 0.02a | |
| C1-109 | 9.80 ± 0.21 | 6.22 ± 0.38 | 7.74 ± 1.79 | 1.31 ± 0.09c,e | |
| 4542 | 9.55 ± 0.15 | 7.04 ± 0.01 | 8.63 ± 0.03 | 1.18 ± 0.02c,d | |
| 7418 | 9.42 ± 0.06 | 7.30 ± 0.04 | 8.46 ± 0.05 | 1.16 ± 0.01c,d | |
| L. innocua | R255a | 9.75 ± 0.04 | 7.32 ± 0.81 | 8.98 ± 0.03 | 1.15 ± 0.11a,c,d,e |
a
After growth at 30°C for 24 h at an initial cell density of 40 cells/ml.
b
When inoculating 100 μl from UVM I into 9.9 ml of UVM II, followed by growth at 30°C for 24 h.
c
Growth rates with the same roman letter are not statistically significantly different (Student's t test at 5% level).