| Campylobacter gracilis |
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Pseudomonadota (Proteobacteria), Class Epsilonproteobacteria, Order Campylobacterales, Family Campylobacteraceae,
Genus Campylobacter, Campylobacter, gracilis (Tanner et al. 1981) Vandamme et al. 1995.
Basonym: Bacteroides gracilis Tanner et al. 1981.
Genus Campylobacter, Campylobacter, gracilis (Tanner et al. 1981) Vandamme et al. 1995.
Basonym: Bacteroides gracilis Tanner et al. 1981.
Gram-negative cells, small and straight, 0.4-4 x 6 μm, with rounded or tapered ends.
Nonmotile.
Nonmotile.
Colonies vary from small pinpoint, 1 mm in diameter to spreading colonies up to 5
mm in diameter. Agar pitting is medium dependent, negative in anaerobic, 3-days-old
cultures on 5% blood agar. Translucent colonies are produced on blood agar base.
Does not grow microaerobically on common agar bases in an atmosphere without
hydrogen. Does not grow in semisolid medium (0.16% agar), in air, or in an
atmosphere containing O2:CO2:N2 (5:10:85). Growth is stimulated in broth cultures by
formate and fumarate.
Strains grow in the presence of 0.1% potassium permanganate, 1% glycine and
0.05% basic fuchsin but not in the presence of 0.04% triphenyl-tetrazolium chloride,
64 mg/l cefoperazone, or 2% ox bile. A few strains (14%) grow on 0.01% Janus green
medium and in 2% NaCl. No growth at 25 ºC.
mm in diameter. Agar pitting is medium dependent, negative in anaerobic, 3-days-old
cultures on 5% blood agar. Translucent colonies are produced on blood agar base.
Does not grow microaerobically on common agar bases in an atmosphere without
hydrogen. Does not grow in semisolid medium (0.16% agar), in air, or in an
atmosphere containing O2:CO2:N2 (5:10:85). Growth is stimulated in broth cultures by
formate and fumarate.
Strains grow in the presence of 0.1% potassium permanganate, 1% glycine and
0.05% basic fuchsin but not in the presence of 0.04% triphenyl-tetrazolium chloride,
64 mg/l cefoperazone, or 2% ox bile. A few strains (14%) grow on 0.01% Janus green
medium and in 2% NaCl. No growth at 25 ºC.
Isolated from gingival crevices and from various infections; soft tissue abscesses, pneumonia, empyema and wound in humans.
Associated with with deep tissue infection in humans.
- 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. - P. Vandamme, M. I. Daneshvar, F. E. Dewhirst, B. J. Paster, K. Kersters, H. Goossens, and C. W. Moss. Chemotaxonomic
Analyses of Bacteroides gracilis and Bacteroides ureolyticus and Reclassification of B. gracilis as Campylobacter gracilis comb.
nov. Int J Syst Bacteriol January 1995 45:145-152.
Usually positive results for indoxyl acetate hydrolysis & nitrate reduction.
Negative results for oxidase, catalase (most strains), urea hydrolysis, hippurate hydrolysis, selenite reduction & H2S production on
TSI. No carbohydrates fermentation.
Negative results for oxidase, catalase (most strains), urea hydrolysis, hippurate hydrolysis, selenite reduction & H2S production on
TSI. No carbohydrates fermentation.
(c) Costin Stoica
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