Parasite
Cyclospora cayetanensis
Produce-linked acid-fast coccidian
sy-kloh-SPOR-uh ky-uh-tuh-NEN-sis
High-yield clue
Variably modified-acid-fast oocysts that autofluoresce blue under UV and are ~8-10 microns (about twice Cryptosporidium) is the key study clue.
Overview
An intestinal coccidian parasite whose oocysts require environmental sporulation before becoming infectious, so it spreads via contaminated fresh produce and water. It matters as the classic outbreak-associated watery-diarrhea coccidian.
Classification
- Protozoa
- Apicomplexa
- Coccidian
- Oocyst-forming intestinal parasite
Lab & identification clues
- Modified acid-fast stool oocysts (variable uptake)
- Blue oocyst-wall autofluorescence under UV
- Oocyst ~8-10 microns vs Cryptosporidium ~4-6
- Not infectious until sporulated
Associations
- Imported fresh produce (raspberries, cilantro, basil) outbreaks
- Fecal-oral via contaminated water
- Prolonged/relapsing watery diarrhea vocabulary
- Seasonal outbreak epidemiology framing
Commonly confused with
- Cryptosporidium
- Cystoisospora belli
Your notes
Original student-study summary. Sources checked: OpenStax Microbiology 2e, NCBI Bookshelf Medical Microbiology, and CDC topic pages where applicable; reviewed 2026-06. Educational only; no diagnosis, treatment, dosing, or specimen-handling guidance.