Evans, Doyle J., Jr. Bacterial Enteropathogens Laboratory, Veterans Affairs Medical Center, Houston, Texas.
Last reviewed:November 2020
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A genus of Gram-negative bacilli whose members are spiral-shaped. Bacteria belonging to the genus Helicobacter are shaped like a spiral or helix. They show corkscrewlike motility generated by multiple, usually polar flagella (see illustration). The presence of Helicobacter bacilli in the stomach often leads to various digestive illnesses, including peptic ulcers, gastritis (inflammation of the stomach), and stomach cancer. In general, Helicobacter bacilli require low concentrations of oxygen for maximum growth and produce a number of important enzymes, including oxidase, catalase, and urease. See also: Bacteria; Bacteriology; Cancer; Cilia and flagella; Enzyme; Gastrointestinal tract disorders; Medical bacteriology; Ulcer
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