5 Things to Know About the Cyclospora Outbreak

Right now, a microscopic parasite is causing spikes in gastrointestinal illness across the country. You may have seen it in the headlines: it's called Cyclospora.

It can bypass standard hospital stool tests and may be hiding in plain sight on everyday produce. If you or someone you know has been dealing with lingering stomach issues for weeks, here's what to know about the outbreak.

1. This isn't a stomach flu. It's a parasite.

When your doctor orders routine labs, they are typically looking at a defined set of markers: kidney function, liver enzymes, blood cell counts, electrolytes, blood sugar. These are valuable and catch a meaningful range of systemic disease.

What they are not designed to detect:

• Functional GI conditions like IBS, functional dyspepsia, or motility disorders. None of these leave a reliable fingerprint in standard serum panels.
• Early inflammatory bowel disease. CRP and ESR, markers of systemic inflammation, may be normal in early or mild IBD. A normal CRP does not rule out Crohn's disease or ulcerative colitis.
• Celiac disease, unless your physician specifically orders tissue transglutaminase IgA antibodies. It is not part of a standard panel and is frequently missed for years as a result.
• Small intestinal bacterial overgrowth (SIBO), which requires breath testing, not bloodwork.
• Gastroparesis and other motility disorders, which require specialized gastric emptying studies.

2. The numbers are bigger than they look.

The CDC has confirmed 145 cases across 17 states through mid-June. Michigan alone reported over 300 cases in a single week, in a state that typically sees 50 cases a year. That gap between official counts and reality is not new. Most people with a GI bug never get tested, so the confirmed number is always a floor, not a ceiling.

3. It slips past a standard stool test.

Here's the part most people don't know: a routine stool culture does not reliably catch Cyclospora. It requires a specific ova and parasite exam, and even then the organism can be missed if the lab isn't looking for it or the sample isn't handled correctly.

Some patients are told they have “post-viral IBS” or a lingering stomach bug for two or three weeks before anyone orders the right test. If your symptoms are dragging on longer than a typical GI illness should, mention that to whoever is treating you.

4. It's not contagious person to person, and that changes how you should think about exposure.

You can get it from consuming contaminated food or water. Like other protozoa, Cyclospora isn't transmitted directly through close contact or sneezing. This distinction matters because the people around you aren't at risk from you—or vice versa—but whatever was in your fridge or on your plate might still be in someone else's.

5. Most people recover without treatment. But there's a but.

Healthy adults typically clear cyclosporiasis on their own within a few weeks. When treatment is needed, it's a specific antibiotic combination, not a general antibiotic. Young children, older adults, and anyone who is immunocompromised can become dehydrated quickly, increasing the risk of hospitalization.

• Wash produce under running water, even pre-washed bags.
• Use a produce brush on firm fruits and vegetables.
• Cut away bruised or damaged spots before eating.
• If you're symptomatic, prioritize fluids and electrolytes over food.

See a doctor if: symptoms last more than a few days, you can't keep fluids down, or you're in a higher-risk group. Dehydration from GI illness is one of the more preventable reasons people end up in an ER.