The Cyclospora outbreak sweeping the United States has exposed critical gaps in the nation's food safety surveillance system. A patient arrives after two weeks of relentless watery diarrhea, sometimes 20 episodes a day. She has lost weight and cannot keep fluids down. Her stool tests come back negative. Unless someone thinks to order an assay that includes Cyclospora cayetanensis, she may leave without a diagnosis and stay ill for weeks longer.
Why Cyclospora Is Easy to Miss
Cyclospora is easy to miss in a clinic. Many routine stool tests do not include it, so a clinician must consider the parasite before the laboratory will look for it. You find it on purpose, or you do not find it. Last year the federal government arranged for the country to miss it too.
On 1 July 2025, the CDC downgraded FoodNet, the active surveillance network it has run with the FDA, the USDA and 10 state health departments since 1995, making tracking of Cyclospora optional at its sites, along with listeria, campylobacter, shigella, vibrio and yersinia. Of the eight pathogens it was built to watch, six were downgraded to optional. Salmonella and E coli remained mandatory.
Unprecedented Case Numbers
This summer, cyclosporiasis is moving through the US food supply on a scale not seen in years. As of 15 July, the CDC had confirmed 1,645 domestically acquired cases across 34 states, with 141 hospitalizations, and said it was aware of more than 5,100 further cases awaiting analysis. Michigan, which in a normal year records 40 to 50 cases, has reported more than 3,700.
How the Parasite Spreads
Investigators still cannot identify the source, or sources, of the contamination. That is not for want of effort. It follows from the biology. Cyclospora is not transmitted directly from person to person; the oocysts it sheds must mature in the environment for days before they can infect anyone. Every case traces back to contaminated food or water that someone consumed. The incubation period runs about a week. By the time a patient is ill enough to be tested, the meal is a hazy memory.
Comparison: Cyclospora vs. Other Foodborne Pathogens
| Pathogen | Testing Requirement | Incubation Period | 2025 US Cases (as of July 15) |
|---|---|---|---|
| Cyclospora | Optional under FoodNet | ~7 days | 1,645 confirmed |
| Salmonella | Mandatory | 6-72 hours | Not reported |
| E. coli | Mandatory | 3-4 days | Not reported |
| Listeria | Optional | 1-4 weeks | Not reported |
Key Takeaways
- Cyclospora is often missed in routine stool tests; specific assays are required.
- The CDC's FoodNet downgrade made tracking optional for six major pathogens.
- Michigan has seen an explosion of cases, from 40-50 annually to over 3,700.
- Contaminated produce is the primary source, with a 7-day incubation period complicating tracebacks.
- Patients must advocate for specific testing if symptoms persist.
FAQ
What is Cyclospora?
Cyclospora is a microscopic parasite that causes cyclosporiasis, an intestinal infection with symptoms like watery diarrhea, weight loss, and fatigue.
How is Cyclospora diagnosed?
Diagnosis requires a specific stool test that looks for Cyclospora. Routine stool tests often miss it, so doctors must explicitly request the assay.
What foods are commonly linked to Cyclospora outbreaks?
Fresh produce like raspberries, basil, cilantro, and lettuce have been linked to past outbreaks. The current source remains unknown.
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