Helicobacter trogontum
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Epsilonproteobacteria, Order Campylobacterales, Family Helicobacteraceae, Genus Helicobacter,
Helicobacter trogontum Mendes et al. 1996.

Synonyms:
Flexispira taxon 6,  Flexispira taxon 1, Flexispira taxon 4, Flexispira taxon 5, Helicobacter rappini, Flexispira rappini.
Gram-negative, fusiform cells, slightly spiral, 0.6-0.7 x 4-6 μm. Periplasmic fibers are
coiled around the cell body, giving a crisscross appearance to the bacterial surface.
Coccoid forms appear in older cultures. Motile by means of 3-7 sheathed flagella
arranged in tufts at both cell's ends. Nonsporulated.
Colonies are initially punctiform but often spread out as thin layers on the surface of
agar media after 3-5 days of microaerobic incubation at 37 ºC. Can grow at 42 ºC, but
not at 25 ºC. No growth occurs on brucella agar plates containing 1% glycine or 1.5, 2,
or 3% NaCl. Sensitive to metronidazole (4 μg) but resistant to cephalothin (30 μg) and
nalidixic acid (30 μg) in disk diffusion tests.
Isolated from colonic mucosa of rats.
Undetermined.
  1. George M. Garrity, Julia A. Bell and Timothy Lilburn, 2001. Family II. Helicobacteraceae. In: Bergey’s Manual of Systematic
    Bacteriology, Second edition, Vol 2, part C, George M. Garrity (Editor-in-Chief), pp 1168-1195.
  2. Edilberto N. Mendes, Dulciene M. M. Queiroz, Floyd E. Dewhirst, Bruce J. Paster, Silvia B. Moura, and James G. Fox. Helicobacter
    trogontum sp. nov., Isolated from the Rat Intestine. Int J Syst Bacteriol October 1996 46:916-92.
Positive results for catalase, oxidase, urease, nitrate reduction, ornithine
decarboxylase, H
2S production, gamma-glutamyl transpeptidase.

Negative results for growth in 1% glycine, hippurate hydrolysis.

Variable results for alkaline phosphatase (1/6).
(c) Costin Stoica
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