Phenotypic and Genotypic Characterization of Atypical Listeria monocytogenes and Listeria innocua Isolated from Swine Slaughterhouses and Meat Markets
Table 1
Sources and phenotypic and genotypic characteristics of the Listeria monocytogenes isolates used in this study.
Isolate
Species
Serotype
Origin
Site
Year
ALOA
Hemolysis
inlA
inlB
inlC
plcA
plcB
prfA
hly
Lm1
L. monocytogenes
1/2a
Slaught 1
Floor
2008
Halo
Positive
+
+
+
+
+
+
+
+
Lm2
L. monocytogenes
1/2b
Slaught 1
Floor
2008
Halo
Positive
+
+
+
+
+
+
+
+
Lm3
L. monocytogenes
4b
Market 1
Floor
2008
Halo
Positive
+
+
+
+
+
+
+
+
Lm21
L. monocytogenes
1/2a
Slaught 1
Floor
2008
Halo
Positive
+
+
+
+
+
+
+
+
Lm22
L. monocytogenes
1/2a
Slaught 1
Floor
2008
Halo
Positive
+
+
+
+
+
+
+
+
Lm23
L. monocytogenes
1/2a
Slaught 1
Floor
2008
Halo
Positive
+
+
+
+
+
+
+
+
Lm25
L. monocytogenes
1/2a
Slaught 1
Floor
2008
Halo
Positive
+
+
+
+
+
+
+
+
Lm26
L. monocytogenes
1/2a
Slaught 1
Floor
2008
Halo
Positive
+
+
+
+
+
+
+
+
Lm27
L. monocytogenes
1/2a
Slaught 1
Floor
2008
Halo
Positive
+
+
+
+
+
+
+
+
Lm28
L. monocytogenes
1/2a
Market 2
Pork
2008
Halo
Weak positive
+
+
+
+
+
+
+
+
Lm29
L. monocytogenes
1/2a
Market 2
Pork
2008
Halo
Weak positive
+
+
+
+
+
+
+
+
Lm30
L. monocytogenes
1/2a
Market 2
Pork
2008
Halo
Weak positive
+
+
+
+
+
+
+
+
Lm31
L. monocytogenes
1/2a
Market 2
Pork
2008
Halo
Weak positive
+
+
+
+
+
+
+
+
Lm34
L. monocytogenes
1/2a
Human
Blood
1989
Halo
Strong positive
+
+
+
+
+
+
+
+
Lm35
L. monocytogenes
4b
Human
Blood
2004
Halo
Strong positive
+
+
+
+
+
+
+
+
Lm36
L. monocytogenes
4b
Human
Blood
1977
Halo
Strong positive
+
+
+
+
+
+
+
+
Lm37
L. monocytogenes
4b
Human
CSF
1982
Halo
Strong positive
+
+
+
+
+
+
+
+
Lm38
L. monocytogenes
1/2b
Human
CSF
1983
Halo
Strong positive
+
+
+
+
+
+
+
+
Lm39
L. monocytogenes
1/2a
Human
Placenta
1978
Halo
Strong positive
+
+
+
+
+
+
+
+
Lm39a
L. monocytogenes
1/2a
Human
Placenta
1978
Halo
Positive
+
+
+
+
+
+
+
+
Lm40
L. monocytogenes
1/2a
Human
Blood
1985
Halo
Strong positive
+
+
+
+
+
+
+
+
Lm41
L. monocytogenes
4b
Human
CSF
1997
Halo
Strong positive
+
+
+
+
+
+
+
+
Lm42
L. monocytogenes
4b
Human
CSF
1997
Halo
Positive
+
+
+
+
+
+
+
+
Lm43
L. monocytogenes
1/2a
Human
CSF
1983
Halo
Positive
+
+
+
+
+
+
+
+
Lm4
L. monocytogenes
1/2a
Market 2
Floor
2008
Halo
Weak positive
+
+
+
+
+
+
+
+
Lm33
L. monocytogenes
1/2a
Market 2
Floor
2008
Halo
Weak positive
+
+
+
+
+
+
+
+
Lm10
L. monocytogenes
4b
ATCC 19115
—
—
Halo
Strong positive
+
+
+
+
+
+
+
+
Lm15
L. monocytogenes
1/2a
ATCC 19111
—
—
Halo
Strong positive
+
+
+
+
+
+
+
+
Slaught 1: slaughterhouse 1. CSF: cerebrospinal fluid. All isolates were positive for fragments of inlJ but presented variable results for hole gene amplification (see Table 4).
