Phylum Proteobacteria, Class Epsilonproteobacteria, Order Campylobacterales, Family Helicobacteraceae, Genus Helicobacter,
Helicobacter canadensis Fox et al. 2002.
Gram-negative, curved to spiral (1–3 turns) rods, 0.3 x 1.5-4 μm. Motile by means of
single unipolar or bipolar unsheathed flagella.
Culture on 5% sheep blood agar under microaerobic conditions does not produce
single colonies; growth occurs as a thin spreading film. Grow at 37 and 42 ºC, but not
at 25 ºC. Can grow in 1% glycine. Resistant to nalidixic acid (30 μg) and cephalothin
(30 μg) in disk diffusion tests. Variable growth in 2% bile. No growth in 2% NaCl.
Isolated from human diarrhea.
- 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.
- James G. Fox, Chih Ching Chien, Floyd E. Dewhirst, Bruce J. Paster, Zeli Shen, Pasquale L. Melito, David L. Woodward, and Frank
G. Rodgers. Helicobacter canadensis sp. nov. Isolated from Humans with Diarrhea as an Example of an Emerging Pathogen. J.
Clin. Microbiol. July 2000 38:7 2546-2549.
Positive results for catalase, indoxyl acetate hydrolysis and oxidase.
Negative results for urease, alkaline phosphatase and gamma-glutamyl transpeptidase.
Variable results for nitrate reduction.
(c) Costin Stoica