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==''Eimeria'' spp.==
==''Eimeria'' spp.==
*Many species occur
*All species are host specific
*Sporulated oocyst has 4 sporocysts which each contain 2 sporozoites
**Oocyst measures 20-50μm
*Direct life cycle
*Transmission by the oral-faecal route
==''Isospora'' spp.==
==''Isospora'' spp.==
*Many species occur
*All species are host specific
*Sporulated oocyst conatins 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
==Coccidia of Poultry==
==Coccidia of Poultry==