Regulation of Respiratory Pathways in Campylobacterota: A Review. van der Stel AX, Wösten MMSM. Front Microbiol. 2019 Jul 30;10:1719. The Campylobacterota, previously known as Epsilonproteobacteria, are a large group of Gram-negative mainly, spiral-shaped motile bacteria. Some members like the Sulfurospirillum spp. are free-living, while others such as Helicobacter spp. can only persist in strict association