Phylum Proteobacteria, Class Epsilonproteobacteria, Order Campylobacterales, Family Helicobacteraceae, Genus Helicobacter,
Helicobacter equorum Moyaert et al. 2007.
Gram-negative, curved rods, rods (1.5–4 x 0.3 μm. Nonsporulating. Motile by a single,
sheathed monopolar ﬂagellum. Cells do not possess a periplasmic ﬁbril.
On 10 % horse blood agar, a thin, transparent spreading ﬁlm is seen after 3-4 days
microaerophilic incubation at 37 ºC. No colonies were observed. No growth is
obtained either in aerobic or anaerobic conditions at 37 ºC, or at 25 ºC or 42 ºC under
microaerobic conditions.No growth is obtained on media containing 1 % glycine, 1 %
ox bile, 1.5 % NaCl or 5 μg metronidazole/ml.
Isolated from horse faeces in Merelbeke, Belgium. Resistant to cephalotin and nalidixic acid.
- H. Moyaert, A. Decostere, P. Vandamme, L. Debruyne, J. Mast, M. Baele, L. Ceelen, R. Ducatelle, and F. Haesebrouck.
Helicobacter equorum sp. nov., a urease-negative Helicobacter species isolated from horse faeces. Int J Syst Evol Microbiol
February 2007 57:213-218.
Positive results for alkaline phosphatase, L-arginine arylamidase, catalase, esterase, nitrate reduction and oxidase.
Negative results for DNase, gamma-glutamyltransferase, glucose fermentation (acid production), hippuricase, H2S production, indoxyl
acetate hydrolysis, pyrrolidonyl arylamidase, L-aspartate arylamidase, triphenyl tetrazolium chloride reduction, and urease.
(c) Costin Stoica