Phylum Proteobacteria, Class Epsilonproteobacteria, Order Campylobacterales, Family Helicobacteraceae, Genus Helicobacter,
Helicobacter baculiformis Baele et al. 2008.
Characterization is based on a single strain description.
Gram-negative, slender spiral rods, 10 x 1.0 μm. Motile by means of tufts of up to 11
sheathed flagella at both ends of the cells. Four periplasmic fibrils running along the
external side of the helix are present. Coccoid forms develop in old cultures. Non-
Grow on BHI agar, Brucella agar and on Mueller–Hinton agar supplemented with 20
% fetal calf serum or with 10% defibrinated horse blood. Grows in microaerophilic
conditions and in a 5% CO2-supplemented atmosphere (weak). Unable to grow
aerobically. Can grow at 37 ºC, not at 25 or 42 ºC. No growth on media supplemented
with 1.5 % NaCl, 1% glycine or 1% ox bile.
Isolated from the gastric mucosa of a cat. Resistant to cephalothin (30 μg) and intermediate to nalidixic acid (30 μg).
- M. Baele, A. Decostere, P. Vandamme, K. Van den Bulck, I. Gruntar, J. Mehle, J. Mast, R. Ducatelle, and F. Haesebrouck.
Helicobacter baculiformis sp. nov., isolated from feline stomach mucosa. Int J Syst Evol Microbiol February 2008 58:357-364.
Positive results for arginine arylamidase, alkaline phosphatase, oxidase, catalase, gamma glutamyl transpeptidase, nitrate
reduction, urease & TTC reduction.
Negative results for hippurate hydrolysis, indoxyl acetate hydrolysis & pyrrolidonyl arylamidase.
(c) Costin Stoica