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What you should know:

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. 


Domain Bacteria

    Phylum Proteobacteria  

        Class ε - Proteobacteria 

Bergey's Manual Volume 2: The Proteobacteria