The composition and prevalence of bacterial genera in the mouth, such as *Streptococcus*, *Haemophilus*, and *Neisseria*, vary significantly between different individuals.

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The human mouth hosts thousands of bacterial species whose distribution is determined by oxygen exposure. For example, oxygen-exposed surfaces like the inner cheek have the least diverse microbiota, dominated by *Streptococcus*, whereas oxygen-limited spaces like the crypts of the tongue and interdental spaces support highly diverse microbiota, including anaerobes like *Bacteroides* and *Fusobacterium*.

Diversity and Composition of Oral Microbiota

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.

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