Isospora spp.
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- Many species occur
- All species are host specific
- Sporulated oocyst contains 2 sporocysts each with 4 sporozoites
- Oocyst measures 20-50μm
- Usually direct life cycle
- Transmission via the oral-faecal route
- Some species use facultative intermediate hosts and form tissue cysts
- Transmission via faecal-oral route or by ingestion of the intermediate host