*Campylobacter jejuni* is a bacterial species within the genus *Campylobacter* that is a common cause of food poisoning, manifesting as severe enteritis. This pathogen is frequently carried in the gastrointestinal tracts and feces of chickens, and its transmission to humans typically occurs through the consumption of poultry products contaminated during processing.

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Epsilonproteobacteria is the smallest class of Proteobacteria. They are gram-negative, microaerophilic bacteria, meaning they only require small amounts of oxygen in their environment. Clinically relevant genera within this class include *Campylobacter* and *Helicobacter*, both of which include human pathogens.

Epsilonproteobacteria

https://openstax.org/details/books/microbiology/

Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

OpenStax Microbiology Textbook

*Helicobacter pylori* is a helical, flagellated bacterium in the genus *Helicobacter*. While it is a beneficial member of the stomach microbiota, it is also the most common cause of chronic gastritis, stomach ulcers, and duodenal ulcers, and is linked to stomach cancer. It survives in the highly acidic environment of the stomach by producing urease and other enzymes that modify its environment to make it less acidic.

*Helicobacter pylori*

*Campylobacter* is a genus of gram-negative, microaerophilic bacteria within the class Epsilonproteobacteria that includes human pathogens. It can cause food poisoning that manifests as severe enteritis (inflammation in the small intestine).

Campylobacter

*Helicobacter* is a genus of gram-negative, microaerophilic bacteria within the class Epsilonproteobacteria that includes human pathogens. It contains helical, flagellated bacteria such as *Helicobacter pylori*.

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