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Cryptosporidiosis
[Cryptosporidium spp.]

Cryptosporidium spp. oocysts are rounded and measure 4.2 to 5.4 µm in diameter.  Sporozoites are sometimes visible inside the oocysts, indicating that sporulation has occurred.  Staining of Cryptosporidium spp. oocysts can be variable.  In particular, infections that are resolving can be accompanied by increasing numbers of non-acid-fast oocysts “ghosts.”

Cryptosporidium sp. oocysts stained with safranin. Cryptosporidium sp. oocysts stained with safranin.
A B

A:  Cryptosporidium sp. oocysts stained with safranin.
B:  Cryptosporidium sp. oocysts stained with safranin.

 

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