Phenotypic and Genotypic Characterization of Atypical Listeria monocytogenes and Listeria innocua Isolated from Swine Slaughterhouses and Meat Markets
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
inlB
inlC
inlJ
plcA
plcB
prfA
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. Atypical isolates were positive for fragments of inlAB operon and hly but presented variable results for inlA and hly complete amplification (see Table 4).