Helicobacter fennelliae
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Epsilonproteobacteria, Order Campylobacterales, Family Helicobacteraceae, Genus Helicobacter,
Helicobacter fennelliae (Totten et al. 1988) Vandamme et al. 1991.

Basonym:
Campylobacter fennelliae Totten et al. 1988.
Slender spiral rods, 0.3-0.5 x 1.5-5.0 μm in 48h cultures. Fast corkscrew-like motility
by means of a single polar sheathed flagellum. Single curved, S-shaped, and straight
rods are occasionally seen. Cells may become coccoid in old cultures.
Colonies of 48 h old cultures are pinpoint and translucent. On freshly prepared or
moist media, growth often occurs as a flat and spreading zone, and discreet colonies
may be rare. Strains may produce an odor resembling that of hypochlorite cleaning
powders.
Grow in microaerobic conditions at 37 ºC, but not at 25 ºC. Approximately one-third of
strains grow at 42 ºC. Hydrogen stimulates or is essential for growth. No growth in
aerobic or anaerobic conditions.
Grow on media containing 0.04% triphenyl-tetrazolium chloride; reduction of this
compound is concurrently observed and bacterial growth is of a metallic red sheen.
Isolated from rectal swabs and blood of men, blood and feces of children with diarrhea.

Susceptible to ampicillin, gentamicin, doxycycline, tetracycline, ceftriaxone, rifampin, spectinomycin, nalidixic acid, chloramphenicol,
clindamycin, erythromycin & metronidazole. Resistant to 5-fluorouracil, trimethoprim & streptomycin. Most strains are susceptible to
sulfamethoxazole (4 μg/ml) and trimethoprim-sulfamethoxazole (8 μg/ml).
Undetermined. Associated with proctitis and proctocolitis with or without accompanying HIV infection. Isolated from feces of children
with diarrhea.
  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. P. Vandamme, E. Falsen, R. Rossau, B. Hoste, P. Segers, R. Tytgat, and J. De Ley. Revision of Campylobacter, Helicobacter, and
    Wolinella Taxonomy: Emendation of Generic Descriptions and Proposal of Arcobacter gen. nov. Int J Syst Bacteriol January 1991
    41:88-103.
  3. John Stanley, Dennis Linton, André P. Burnens, Floyd E. Dewhirst, Stephen L. W. On, Anthony Porter, Robert J. Owen, and
    Menelaos Costas. Helicobacter pullorum sp. nov. - genotype and phenotype of a new species isolated from poultry and from
    human patients with gastroenteritis. Microbiology December 1994 140:3441-3449.
  4. J A Kiehlbauch, D J Brenner, D N Cameron, A G Steigerwalt, J M Makowski, C N Baker, C M Patton, and I K Wachsmuth. Genotypic
    and phenotypic characterization of Helicobacter cinaedi and Helicobacter fennelliae strains isolated from humans and animals. J
    Clin Microbiol. Nov 1995; 33(11): 2940–2947.
Positive results for oxidase, catalase, gamma-glutamyl transpeptidase, indoxyl acetate reduction, tolerance of 1% glycine & reduction
of 0.04% TTC.

Negative results for nitrate reduction, urease, tolerance to1.0% glycine, tolerance to 1% bile, safranin 'O', methyl orange , H
2S
production in TSI (some strains are positive on H
2S-lead acetate paper).

Variable results for alkaline phosphatase.
(c) Costin Stoica
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