Phenotypic and Genotypic Characterization of Atypical Listeria monocytogenes and Listeria innocua Isolated from Swine Slaughterhouses and Meat Markets

Table 4

Distribution of the results of the virulence gene amplification from Listeria species.

Primer	Species	Positive	Negative
		𝑁 (%)	𝑁 (%)
𝑖𝑛𝑙𝐶_𝐿𝑖𝑢^1	L. monocytogenes	28 (100.0)	0
	L. innocua	0	12 (100.0)
inlC In–End	L. monocytogenes	28 (100.0)	0
	L. innocua	5 (41.7)	7 (58.3)
prfA Johnson–End	L. monocytogenes	28 (100.0)	0
	L. innocua	0	12 (100.0)
𝑝𝑟𝑓𝐴_𝐽𝑜ℎ𝑛𝑠𝑜𝑛^2	L. monocytogenes	28 (100.0)	0
	L. innocua	0	12 (100.0)
prfA Detec	L. monocytogenes	28 (100.0)	0
	L. innocua	0	12 (100.0)
plcA ext	L. monocytogenes	28 (100.0)	0
	L. innocua	5 (41.7)	7 (58.3)
plcA Detec	L. monocytogenes	28 (100.0)	0
	L. innocua	5 (41.7)	7 (58.3)
plcB ext	L. monocytogenes	28 (100.0)	0
	L. innocua	0	12 (100.0)
inlB In– 𝑆𝑒𝑞3	L. monocytogenes	28 (100.0)	0
	L. innocua	0	12 (100.0)
𝑖𝑛𝑙𝐵𝑆𝑒𝑞2	L. monocytogenes	28 (100.0)	0
	L. innocua	0	12 (100.0)
inlA In–Detec	L. monocytogenes	28 (100.0)	0
	L. innocua	0	12 (100.0)
𝑖𝑛𝑙𝐴𝐵_𝐽𝑢𝑛𝑔^3	L. monocytogenes	28 (100.0)	0
	L. innocua	5 (41.7)	7 (58.3)
hly ext	L. monocytogenes	28 (100.0)	0
	L. innocua	0	12 (100.0)
hly End	L. monocytogenes	28 (100.0)	0
	L. innocua	5 (41.7)	7 (58.3)
ℎ𝑙𝑦_𝐵𝑜𝑟𝑑𝑒𝑟^4	L. monocytogenes	28 (100.0)	0
	L. innocua	5 (41.7)	7 (58.3)
hly Detec	L. monocytogenes	28 (100.0)	0
	L. innocua	5 (41.7)	7 (58.3)
𝑖𝑛𝑙𝐽_𝐿𝑖𝑢^1	L. monocytogenes	28 (100.0)	0
	L. innocua	0	12 (100.0)
inlJ ext	L. monocytogenes	23 (82.1)	5 (17.9)
	L. innocua	0	12 (100.0)

1Primers described by Liu et al. [16]. ²Primers described by Johnson et al. [6]. ³Primers described by Jung et al. [17]. ⁴Primers described by Border et al. [22].