Table 1.
Generation times and 48 h selective BLEB enrichment populations for Listeria isolates used in this study.
| Straina | Serogroup | GTb | 48 h Populationc | Sourced |
|---|---|---|---|---|
| Lm-050 | 1/2a | 1.7 ± 0.1 abc | 9.3 ± 0.1 c | RTE deli meat sandwich |
| Lm-057 | 1/2a | 1.4 ± 0.1 a | 9.1 ± 0.1 bc | Frozen blueberries |
| Lm-008 | 1/2b | 1.4 ± 0.2 a | 8.8 ± 0.2 ab | Butter |
| Lm-060 | 1/2b | 1.8 ± 0.2 bcd | 8.8 ± 0.2 ab | Frozen guacamole |
| Lm-006e | 4b | 1.9 ± 0.1 cde | 9.1 ± 0.2 bc | Smoked salmon |
| Lm-027e | 4b | 1.6 ± 0.1 ab | 9.2 ± 0.1 c | Mexican-style cheese |
| CFSAN-82e | 4b | 1.6 ± 0.1 ab | 8.7 ± 0.1 a | CFSAN culture collection |
| Ls-001 | – | 2.3 ± 0.1 f | 9.4 ± 0.1 c | RTE seafood sandwich manufacturerf |
| Ls-002 | – | 2.3 ± 0.2 f | 9.1 ± 0.1 bc | RTE seafood sandwich manufacturerf |
| Ls-005 | – | 2.1 ± 0.1 ef | 9.3 ± 0.1 c | Multi-product food manufacturerf |
| Ls-009 | – | 2.1 ± 0.1 ef | 9.3 ± 0.1 c | Multi-product food manufacturerf |
| Lw-001 | – | 2.0 ± 0.1 def | 9.4 ± 0.1 c | RTE deli-style sandwich manufacturerf |
| Lw-002 | – | 2.1 ± 0.1 ef | 9.4 ± 0.1 c | RTE tuna saladf |
| Lw-003 | – | 1.8 ± 0.1 bcd | 9.4 ± 0.1 c | RTE seafood sandwich manufacturerf |
| Lw-004 | – | 2.2 ± 0.1 ef | 9.3 ± 0.1 c | RTE seafood sandwich manufacturerf |
a
Strain designations refer to ARL culture collection identification.
b
Generation time in hours. Means within the same column followed by the same letter are not statistically different (P < 0.05).
c
Log CFU/mL. Means within the same column followed by the same letter are not statistically different (P < 0.05).
d
Isolates with the same description are from unrelated samples.
e
Previously published values (Keys et al., 2013).
f
Environmental isolate.