*Bordetella pertussis* is the betaproteobacteria that causes whooping cough. *B. pertussis* infects the cilia in the human respiratory system that paralyzes them which causes a severe cough.

*Bordetella pertussis*

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

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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

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. 

Deltaproteobacteria

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

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