Table 2.
Sources and phenotypic and genotypic characteristics of the Listeria innocua isolates used in this study.
| Isolate | Species | Serotype | Origin | Site | Year | ALOA | Hemolysis | inlA x | inlB | inlC | inlJ | plcA | plcB | prfA | hly x |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lin5 | L. innocua | 6a | Market 1 | Floor | 2008 | Halo* | Weak positive** | − | − | + | − | + | − | − | + |
| Lin6 | L. innocua | 6a | Slaught 2 | Floor | 2008 | Halo* | Weak positive** | − | − | + | − | + | − | − | + |
| Lin7 | L. innocua | 6a | Slaught 2 | Floor | 2008 | Halo* | Weak positive** | − | − | + | − | + | − | − | + |
| Lin8 | L. innocua | 6a | Slaught 2 | Floor | 2008 | Halo* | Weak positive** | − | − | + | − | + | − | − | + |
| Lin9 | L. innocua | 6a | Slaught 2 | Floor | 2008 | Halo* | Weak positive** | − | − | + | − | + | − | − | + |
| Lin16 | L. innocua | 6a | Slaught 1 | Floor | 2006 | Negative | Negative | − | − | − | − | − | − | − | − |
| Lin17 | L. innocua | 6a | Slaught 1 | Floor | 2006 | Negative | Negative | − | − | − | − | − | − | − | − |
| Lin18 | L. innocua | 6a | Slaught 1 | Floor | 2006 | Negative | Negative | − | − | − | − | − | − | − | − |
| Lin19 | L. innocua | 6a | Slaught 1 | Floor | 2006 | Negative | Negative | − | − | − | − | − | − | − | − |
| Lin20 | L. innocua | 6a | Slaught 1 | Floor | 2006 | Negative | Negative | − | − | − | − | − | − | − | − |
| Lin11 | L. innocua | 6a | ATCC 33090 | — | — | Negative | Negative | − | − | − | − | − | − | − | − |
| Lin46 | L. innocua | 6a | CLIP 12612 | — | — | Negative | Negative | − | − | − | − | − | − | − | − |
Slaught 1: slaughterhouse 1; Slaught 2: slaughterhouse 2. *Subtle halo. ** Very weak positive hemolysis. xAtypical isolates were positive for fragments of inlAB operon and hly but presented variable results for inlA and hly complete amplification (see Table 4).