Oocysts
Oocysts
Oocysts (pronounced: /ˈoʊ.ə.sɪsts/) are a type of spore that forms in certain parasitic protozoa. They are a crucial part of the life cycle of these organisms and are responsible for their spread and infection.
Etymology
The term "oocyst" is derived from the Greek words "oo-", meaning egg, and "-cyst", meaning sac. This is a reference to the oocyst's role in containing and protecting the immature stages of the parasite.
Life Cycle
Oocysts are formed in the gut of the host organism after the parasite has been ingested. They are then excreted in the feces and can survive in the environment for long periods of time. When another organism ingests the oocyst, it breaks open in the gut and releases its contents, starting the cycle of infection again.
Related Terms
- Cyst: A general term for a sac-like structure that can contain a variety of different things, including parasites.
- Sporozoite: The stage of the parasite's life cycle that is released from the oocyst and goes on to infect the host's cells.
- Trophozoite: The active, feeding stage of the parasite's life cycle that occurs after the sporozoite has invaded a host cell.
Health Implications
Oocysts are a major concern in public health due to their role in the spread of diseases such as malaria and toxoplasmosis. They are resistant to many common methods of disinfection, making them difficult to eliminate from contaminated water or food.
External links
- Medical encyclopedia article on Oocysts
- Wikipedia's article - Oocysts
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