Phylum Proteobacteria, Class Epsilonproteobacteria, Order Campylobacterales, Family Campylobacteraceae, Genus Campylobacter,
Campylobacter helveticus Stanley et al. 1993.
Gram-negative rods, small, curved, S-shaped or helical, 0.2 x 1.5-3 μm, with rounded
ends. Motile by means of single bipolar flagella.
Colonies are translucent, flat, pinpoint to 0.5 mm in diameter, on blood agar bases
after 48 h. Swarming may occur on moist agar surfaces. No growth at 25 ºC, but
grows at 37 ºC and 42 ºC. Microaerophilic. No growth under anaerobic or aerobic
conditions. Grows microaerobically in the absence of hydrogen. No growth in air or in
a CO2-enriched atmosphere. Can grow on media containing 1.0–1.5% ox-bile,100 U/l
5-fluorouracil, KMnO4, 0.02% safranin, but not on 2% ox bile, 0.04% triphenyl-
tetrazolium chloride, potato starch agar, MacConkey agar or 2% NaCl media.
Isolated from feces of diarrheic and asymptomatic domestic cats, more rarely from dogs.
- Don J. Brenner and J.J. Farmer III, 2001. Family I. Campylobacteraceae. In: Bergey’s Manual of Systematic Bacteriology, Second
edition,Vol 2, part C, George M. Garrity (Editor-in-Chief), pp 1145-1168.
- John Stanley, A. P. Burnens, D. Linton, S. L. W. On, M. Costas, and R. J. Owen. Campylobacter helveticus sp. nov., a new
thermophilic species from domestic animals: characterization, and cloning of a species-specific DNA probe J Gen Microbiol
November 1992 138:2293-2303.
- S. L. W. On, H. I. Atabay, J. E. L. Corry, C. S. Harrington, and P. Vandamme. Emended description of Campylobacter sputorum and
revision of its infrasubspecific (biovar) divisions, including C. sputorum biovar paraureolyticus, a urease-producing variant from
cattle and humans. Int J Syst Bacteriol January 1998 48:195-206.
Usually positive results for oxidase, indoxyl acetate hydrolysis (most strains) and nitrate reduction (most strains).
Negative results for catalase, urea hydrolysis, hippurate hydrolysis (most strains), selenite reduction and H2S production on TSI (most
strains). No carbohydrates fermentation.
(c) Costin Stoica