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Cyclosporiasis
[Cyclospora cayetanensis]

Cyclospora cayetanensis oocysts are spherical, 7.5-10 µm in diameter and unsporulated when passed in feces.  Sporulation in the environment is temperature-dependent and may take one to several weeks for an infective oocyst to contain two sporocysts, each containing two sporozoites.  Oocysts of C. cayetanensis will autofluoresce under ultraviolet (UV) microscopy.

Cyclospora oocyst stained with trichrome Cyclospora oocyst stained with trichrome
A

B

A, B:  Oocysts of C. cayetanensis stained with trichrome; while the oocyst is visible, the staining characteristics are inadequate for a reliable diagnosis.

 
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