While most *Bacteroides* are mutualistic, a few species are pathogenic; for example, *Bacteroides melaninogenicus* can cause wound infections in immunocompromised patients.

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*Bacteroides* is the largest genus in the CFB group, comprising dozens of species that are abundant inhabitants of the human large intestine, making up approximately $${}30$$% of the gut microbiome, with populations reaching up to $${}100$$ billion cells per gram of feces.

*Bacteroides*

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

Most *Bacteroides* species in the human gut share a mutualistic relationship with their host, obtaining nutrients from the intestinal environment while protecting humans by preventing pathogenic microbes from colonizing the large intestine.

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