Coccidians

Cyclospora cayetanensis. Oocysts in fecal smear (ultraviolet epifluorescence, high power). in a methanol-fixed fecal smear examined under ultraviolet epifluorescence, the oocysts of Cyclospora stand out as bright blue circles. The red-staining bodies are yeasts and bacteria. Cryptosporidium parvum does not stain with this procedure, which is advantageous in screening fecal specimens for Cyclospora infection.