🦠microbiology review

Epsilonproteobacteria

Written by the Fiveable Content Team • Last updated August 2025
Written by the Fiveable Content Team • Last updated August 2025

Definition

Epsilonproteobacteria are a class of Proteobacteria, known for being microaerophilic, often found in extreme environments. They include important genera such as Helicobacter and Campylobacter, which are notable pathogens.

5 Must Know Facts For Your Next Test

  1. They are Gram-negative bacteria.
  2. Epsilonproteobacteria are often associated with gastrointestinal diseases in humans.
  3. They thrive in low-oxygen environments, such as the human stomach or hydrothermal vents.
  4. The genus Helicobacter includes species like H. pylori, which is linked to peptic ulcers and gastric cancer.
  5. Campylobacter jejuni is a major cause of foodborne illness worldwide.
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