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[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.

A	B

A, B:  Oocysts of C. cayetanensis viewed under UV microscopy.

C	D

C, D:  Oocysts of C. cayetanensis viewed under UV microscopy.

E	F

E, F:  Oocysts of C. cayetanensis viewed under UV microscopy.