Table 25–1
Some Differentiating Characteristics of the Species of Listeria
Hippurate
CAMP test
Beta
Mol%
Species
Xylose Lactose Galactose Rhamnose Mannitol Hydrolysis S. aureus R. equi Hemolysis G
+ C
Serovars
L. monocytogenes
−
v
v
+
−
+
+
+
+
37–39
∗
L. innocua
−
+
−
(+)
−
+
−
−
+
36–38 4ab, 6a, 6b
L. seeligeri
+
−
−
+
−
w
3 6
†
L. welshimeri
+
V
−
−
−
−
36
6a, 6b
L. ivanovii
+
+
v
−
−
+
−
+
+ +
37–38
5
L. grayi
−
+
+
−
+
−
−
−
−
41–42
Note: v
= variable; w
= weak;
+ = most strains positive.
∗
1/2a, b, c; 3a, b, c; 4a, ab, b, c, d, e; “7.”
†
Same as for L. monocytogenes and L. innocua but no 5 or “7.”
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