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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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

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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.

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

Encystment

Excystment

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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