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Oocyst

The fertilized egg form of parasitic sporozoa protozoa such as Giardia, Cryptosporidium, and Cyclospora that is encapsulated in a tough shell.

The oocyst is an environmentally resistant transmissible form of certain protozoan parasites that is excreted in the feces of an infected host and carried viably in unfiltered water supplies.

See Also: Cryptosporidiosis Cyst Cyst Cyanobacteria-like Bodies (CLBs) Cyclospora Cyst Cryptosporidium Cyst Beaver Fever Giardia Giardia Lamblia