An oocyst is a stage in the life cycle of certain protozoans, such as *Eimeria*, that is formed when gametes undergo syngamy (sexual reproduction). It begins as a developing oocyst, matures into a non-infectious unsporulated oocyst, and eventually becomes an infectious sporulated oocyst that releases sporocysts and sporozoites.

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A protozoan cyst is a dormant cell stage with a protective outer wall that develops from a trophozoite to survive harsh environmental conditions.

Protozoan Cyst

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

Encystment is the cellular process through which an active protozoan trophozoite transforms into a dormant, protective cyst stage.

Encystment

Excystment is the process in which environmental signals trigger a dormant protozoan cyst to become active and emerge as a trophozoite again.

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