Phylum Proteobacteria, Class Epsilonproteobacteria, Order Campylobacterales, Family Helicobacteraceae, Genus Helicobacter,
Helicobacter acinonychis corrig. Eaton et al. 1993.
Old synonym: Helicobacter acinonyx (sic) Eaton et al. 1993 (corrected by Truper and De' Clari 1997).
Gram-negative, short spiral or curved rods, 0.3 x 1.5–2.0 μm. Motile by means of 2-5
monopolar, multiple, sheathed flagella with terminal bulb-like structures. No
endospores are produced.
Colonies on blood agar are small, round (1-2 mm in diameter), colorless, and
translucent. Alpha-hemolytic after three days growth on 5% horse blood agar. No
growth at 25 or 42 ºC. Not swarming. Strains do not grow at 37 ºC anaerobically.
Grow on blood agar media containing 32 mg/l nalidixic acid, but not 32 mg/l
cephalothin, after 3 days microaerobic incubation. No growth in the presence of 1%
glycine or 1.5% NaCI.
Isolated from cheetahs (Acinonyx jubatus). Sensitive to cephalothin, metronidazole, penicillin, ampicillin, nitrofurazone, erythromycin,
gentamicin, chlortetracycline & chloramphenicol. Resistant to nalidixic acid, vancomycin, sulfamethoxazole & trimethoprim.
Undetermined. Isolated from gastric mucosal lesions in cheetahs.
- 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.
- K. A. Eaton, F. E. Dewhirst, M. J. Radin, J. G. Fox, B. J. Paster, S. Krakowka, and D. R. Morgan. Helicobacter acinonyx sp. nov.,
Isolated from Cheetahs with Gastritis. Int J Syst Bacteriol January 1993 43:99-106.
- Hans G. Truper and Lanfranco De' Clari. Taxonomic Note: Necessary Correction of Specific Epithets Formed as Substantives
(Nouns) “in Apposition”. Int J Syst Bacteriol July 1997 47:908-909.
Positive results for oxidase, catalase, alkaline phosphatase, acid phosphatase, phosphohydrolase, urease, gamma-glutamyl
transpeptidase, and arginine beta-naphthylamide aminopeptidase. Leucine and histidine beta-naphthylamides were weakly
Negative results for nitrates reduction, hippurate hydrolysis, H2S production, acid production from: glucose, mannitol, inositol, sorbitol,
rhamnose, sucrose, melibiose, amygdalin & arabinose. Proline, pyroglutamic acid, tyrosine, alanine, phenylalanine, and glycine
beta-naphthylamides are not hydrolyzed.
Variable results for indoxyl acetate hydrolysis.
(c) Costin Stoica