Morphology of Helicobacter pylori. H. pylori, a dominant human pathogen, is now recognized as the first member of an ultrastructurally diverse genus. The predominant morphological form of this genus is curved to spiral; however, some members have either a short or tapered rod shape. All helicobacters are motile by means of flagella. Oct 10, 2019 · Helicobacter pylori (see the image below) is a ubiquitous organism that is present in about 50% of the global population. Chronic infection with H pylori causes atrophic and even metaplastic changes in the stomach, and it has a known association with peptic ulcer disease.

The genus name, Helicobacter, stems from the Greek root, “helix” which describes the bacterium’s curvy shape. Pylori stems from the Greek root “pulouros” which means gatekeeper. This describes the opening between the stomach and the duodenum, where the ulcers form.