*Rickettsia prowazekii* is a species of obligate intracellular bacteria in the genus *Rickettsia*. It is the causative agent of epidemic typhus, is transmitted by lice, and infects human endothelial cells, causing vascular inflammation, high fever, abdominal pain, and delirium.

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Rickettsia is a genus of obligate intracellular Alphaproteobacteria that function as pathogens. These bacteria are metabolically inactive outside of a host cell and cannot synthesize their own adenosine triphosphate (ATP), relying entirely on the host cell's energy resources to complete their life cycle.

Rickettsia

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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

*Rickettsia prowazekii*

*Rickettsia typhi* is a species of obligate intracellular bacteria in the genus *Rickettsia* that causes murine (endemic) typhus, a less severe typhus disease observed seasonally in the southwestern United States.

*Rickettsia typhi*

*Rickettsia rickettsii* is a species of pathogenic, gram-negative, obligate intracellular bacteria in the genus *Rickettsia*. It is the causative agent of Rocky Mountain spotted fever, infects ticks, and can be transmitted to humans via the bite of an infected tick.

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