Phylum Proteobacteria, Class Epsilonproteobacteria, Order Campylobacterales, Family Helicobacteraceae, Genus Helicobacter,
Helicobacter pametensis Dewhirst et al. 1994.
Gram-negative, small curved rods, approximately 0.4 x 1.5 μm with rounded ends.
Motile by means of 2 sheathed flagella, located subterminally, one at each end of the
cell. Occasionally may appear a third flagellum adjacent to one of the other flagella.
Pinpoint to 0.5 mm in diameter colonies, translucent, colorless and weakly hemolytic
after 3 days growth on 5% blood agar at 37 ºC. Can grow at 42 ºC, not at 25 ºC.
Microaerophilic, growing poorly under anaerobic conditions. No growth in air. Grow in
the presence of 1% glycine but not in the presence of 3.5% NaCl
Isolated from the tern, gull, and swine feces and from a feline gastric biopsy. Sensitive to nalidixic acid (32 mg/l).
Unknown. No clinical signs were recorded.
- 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.
- Dewhirst (F.E.), Seymour (C.), Fraser (G.J.), Paster (B.J.) and Fox (J.G.): Phylogeny of Helicobacter isolates from bird and swine
feces and description of Helicobacter pametensis sp. nov. Int. J. Syst. Bacteriol., 1994, 44, 553-560.
Positive results for alkaline phosphatase, catalase, arginine beta-naphthylamide aminopeptidase, nitrate reduction, oxidase and
Negative results for H2S production (on TSI), urease, hippurate hydrolysis, gamma glutamyl transpeptidase, indoxyl acetate
hydrolysis, lysine decarboxylase, ornithine decarboxylase, proline-, pyroglutamate-, tyrosine-, alanine-, phenylalanine-, and glycine
(c) Costin Stoica