Epsilonproteobacteria is a class of Proteobacteria.[1]
The Epsilonproteobacteria consist few known genera, mainly the curved to spirilloid Wolinella spp., Helicobacter spp., and Campylobacter spp. Most of the known species inhabit the digestive tract of animals and serve as symbionts (Wolinella spp. in cows) or pathogens (Helicobacter spp. in the stomach, Campylobacter spp. in the duodenum).
There have also been numerous environmental sequences of Epsilonproteobacteria recovered from hydrothermal vents and cold seep habitats. A member of Bacteria from class Epsilonproteobacteria occurs as endosymbiont of large gills of deep water sea snail Alviniconcha hessleri.[2]
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