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,
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.
Usually positive results for oxidase, indoxyl acetate hydrolysis (most strains) & nitrate reduction (most strains).
Negative results for catalase, urea hydrolysis, hippurate hydrolysis (most strains), selenite reduction & H2S production on TSI (most
strains). No carbohydrates fermentation.
(c) Costin Stoica