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[Cyclospora cayetanensis]

Sporulation of Cyclospora oocysts.  The sequence shows, as observed by DIC microscopy of wet mounts: an oocyst passed in fresh stool (Day 0); sporulated oocysts at days 5 (Day 5) and 10 (Day 10), which both contain 2 sporocysts; and a ruptured oocyst (Rupture), with a sporocyst still inside the oocyst and the other sporocyst just outside—the coiled sporozoites are barely visible inside the sporocysts.