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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, wet mount Cyclospora oocyst, wet mount

A

B

A, B:  Oocysts of C. cayetanensis in unstained wet mounts.  Images courtesy of the Oregon State Public Health Laboratory.

Cyclospora oocyst in unstained wet mount Cyclospora oocyst in unstained wet mount

C

D

C, D:  Oocysts of C. cayetanensis in unstained wet mounts of stool.  Images taken at 1000x magnification.

 
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