Arcobacter halophilus
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Epsilonproteobacteria, Order Campylobacterales, Family Campylobacteraceae, Genus Arcobacter,  
Arcobacter halophilus Donachie et al. 2005.
Gram-negative, slightly curved rods, becoming helical as cells lengthen, 0.4-0.5 x 1.5-
2.5 μm. Motile by means of a polar flagellum.  
Colonies are  smooth, off-white, circular with entire margins, convex, non-swarming
with a sticky consistency and approximately 1–2 mm in diameter after 72 hours
incubation at 18–22 ºC under microaerobic conditions on 5% blood agar containing
3.5% NaCl. Nonhemolytic.
Obligately halophilic; does not grow, or grows only poorly, on media that contain less
than 2%NaCl or less than 0.1% KNO3.

Growth is not observed under microaerobic conditions on media containing 0.04%
triphenyl-tetrazolium chloride, 1% glycine, 0.1% potassium permanganate, 0.001%
sodium arsenite, 0.02–0.05% safranin, 32 mg/L nalidixic acid, 32 mg/L cephalothin,
32 mg/L carbenicillin, 64mg/L cefoperazone, 0.032% methyl orange, 0.1% sodium
deoxycholate, 0.005% basic fuchsin, 00005% crystal violet, 0.01% janus green, 0.1%
sodium fluoride or 0.2% pyronin.

When tested on 5% blood agar containing 3.5% NaCl, growth is observed under aerobic and microaerobic conditions at room
temperature and at 37 ºC, and under anaerobic conditions at 37 ºC. Growth is not observed on 5% blood agar containing
3.5% NaCl under microaerobic conditions at 42 ºC. Grows microaerobically on 5% BA containing 2–4% (w/v) NaCl. Growth is not
observed under microaerobic conditions on nutrient, charcoal, minimal, MacConkey, potato starch, lecithin, tyrosine or casein media.
Isolated from water collected from a hypersaline lagoon on Laysan Atoll in the north-western Hawaiian Islands.
Undetermined.
  1. Stuart P. Donachie, John P. Bowman, Stephen L. W. On, and Maqsudul Alam. Arcobacter halophilus sp. nov., the first obligate
    halophile in the genus Arcobacter. Int J Syst Evol Microbiol May 2005 55:1271-1277.
  2. Luis Collado and Maria José Figueras. Taxonomy, Epidemiology, and Clinical Relevance of the Genus Arcobacter. Clin. Microbiol.
    Rev. 2011, 24(1):174.
Positive results for  oxidase, nitrate reduction, & indoxyl acetate hydrolysis.
Negative results for catalase, urease, alkaline phosphatase, hippurate hydrolysis, DN-ase
& H2S production on TSI.
(c) Costin Stoica
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