Species differentiation and identification in the genus of Helicobacter

Table 2 Locations, key morphological features and growth characteristics of Helicobacter species colonizing animals

Charastistic	H. acinonyx	H. bilis	H. bizzozeronii	H. cholecystus	H. hepaticus	H. nuridarum	H. mustelae	H. nemestrinae	H. pametensis	H. rodentium	H. salomonis	H. trogontum
Host	Cheetah	Mice	Dog	Hamster	Mice	Rat, mice	Ferret	Macaque	Bird, swine	Mice	Dog	Rat
Location	Stomach	Bile,live, intestine	Stomach	Gallbladder	live, intestine	Intestine	Stomach	Stomach	Intestine	Intestine	Stomach	Intestine
Cell size (µm)	0.3 × 1.5 - 2.0	0.5 × 4.0 - 5.0	0.3 × 5 - 10	0.5 - 0.6 × 3.0 - 5.0	0.2-0.3× 1.5 - 5.0	0.5 × 3.5 - 5.0	0.5 - 2.5 × 5.0	0.2 × 2.0 - 5.0	0.4 - 1.5	0.3 × 1.5 - 5.0	0.8 - 1.2 × 5.0 - 7.0	0.6 - 0.7 × 4.0 - 6.0
Flagella
Number	2-5	3-14	10-20	1	2	10-14	4-8	4-8	2	2	10-23	3-7
Distribution	Monopolar Biopolar		Biopolar	Polar	Biopolar	Biopolar	Peritrich ous	Polar	Biopolar	Biopolar	Biopolar	Biopolar
Sheath	+	+	+	+	+	+	+	+	+	-	+	+
Periplasmic fibers	-	+	-	-	-	+	-	-	-	-	-	+
Growth at:
25 °C	-	-	-	-	-	-	-	-	-	-	-	-
37 °C	+	+	+	+	+	+	+	+	+	+	+	+
42 °C	-	+	+	+	-	-	+	+	+	+	-	+
Growth on:
10 g/L glycine	-	+	-	+	+	-	-	-	+	+		-
15 g/L NaCl	-	-		-	+	-	-	-	-	+		-
Toleranceto:
10 g/L bile		+	-	+		-	-	-			-
Safrain ‘O’						-	-	-
Methyl orange						-	-	-
Growth under:
Aerobic conditions				-	-	-	-	-	-	-		-
Microaerobic conditions	+	+	+	+	+	+	+	+	+	+	+	+
Anaerobic				+	+	-	+	Weak+	Weak+	+		-
Susceptibility to:
Nalidixic acid	R	R	R	I	R	R	S	R	S	R	R	R
Cephalothin	S	R	S	R	R	R	R	S	S	R	S	R
Cefoperazone			S			S	R	S			S
Metronidazole	S	S	S		S		S	S			S	S