*H. pylori* is an epsilonproteobacteria that has flagella. *H. pylori* can cause ulcers in the stomach but can also be beneficial to the human stomach microbiome. This bacterium can also adapt to the acidic environment of the stomach with several enzymes that can make it less acidic.

*Helicobacter pylori*

Epsilonproteobacteria is a small group of proteobacteria that require minimal oxygen to survive. 

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- Alphaproteobacteria
- Betaproteobacteria
- Gammaproteobacteria
- Deltaproteobacteria
- Epsilonproteobacteria

Classes of Proteobacteria

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Many alphaproteobacteria are oligate or facultative bacteria that are also capable of living in harsh low-nutrient environments like deep oceanic currents, ice, or deep soil.

Alphaproteobacteria

Betaproteobacteria are diverse in their metabolic functions that allow them to adapt to different environments. Some betaproteobacteria are human pathogens. 

Betaproteobacteria

The gammaproteobacteria class consists of a large and diverse group of gram-negative bacteria. It consists of many pathogens. 

Gammaproteobacteria

Deltaproteobacteria is a class of gram-negative bacteria that contains many sulfate-reducing bacteria. Not many human pathogens are in this class. 

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