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Helicobacter is a curved (vibrioid) Gram-negative bacterium which has been implicated in causing peptic ulcer disease (H. pylori). Helicobacter survives in the stomach by secreting urease, which makes the environment more alkaline. H. pylori also has flagella with thickened ends (see photo) to enable it to move through the thick gastric mucosa.
Class ε - Proteobacteria
Bergey's Manual Volume 2: The Proteobacteria