Not Just a Stomach Bug: What DFW Residents Should Know About This Summer's Cyclospora Cases

As of July 13, 2026, the Texas Department of State Health Services (DSHS) is reporting 68 cyclospora cases that meet the CDC’s outbreak case definition, with cases identified in Dallas, Collin, Denton, and Tarrant counties. Fifteen Texans have been hospitalized; no deaths have been reported statewide, and DSHS notes the true number is likely higher, since many people who get sick recover without ever being tested.

Nationally, the CDC’s live surveillance count has grown to more than 1,600 confirmed domestic cases across 34 states, with Michigan the hardest hit. Public health officials are working on contact tracing and identifying potential sources, and this kind of investigation can change quickly.

Local health departments have said there’s no evidence of a widespread local outbreak or person-to-person spread in North Texas. Cyclospora cases climb almost every summer in Texas, and DSHS issues a statewide health advisory most years ahead of the May–August season. What’s notable this year is the pace. Cases are climbing faster than usual in several states at once.

Cyclospora, full name Cyclospora cayetanensis, is a microscopic parasite, not a virus or bacterium. That distinction matters because it changes both how the illness behaves and how it needs to be treated.

You get it by eating contaminated food or drinking contaminated water. In the U.S., past outbreaks have most often been traced to imported fresh produce — cilantro, basil, raspberries, snow peas, and bagged salad mixes are the most frequently linked items.

The transmission route is known as fecal-oral: the parasite passes through food or water that has come into contact with contaminated feces somewhere along the way, usually before the produce ever reaches a grocery store or restaurant. It’s rarely about food safety in your own kitchen — the contamination almost always happens earlier in the supply chain.

It isn’t contagious the way a cold or stomach virus is. Cyclospora needs one to two weeks outside the human body before it can infect someone else, so it doesn’t pass person-to-person as norovirus does.

Cyclospora symptoms usually start about a week after exposure, though the range runs anywhere from 2 days to 2 weeks. The most common signs:

• Watery, sometimes explosive diarrhea — the hallmark symptom
• Loss of appetite and noticeable weight loss
• Cramping, bloating, and excess gas
• Fatigue that feels out of proportion to everything else
• Low-grade fever, nausea, or vomiting (less common, but possible)

Some infected people have no symptoms at all.

Here’s the detail that matters most: a typical viral stomach bug knocks you flat for a day or two, and then it’s over. Cyclospora doesn’t follow that pattern. Left untreated, it can drag on for weeks, and symptoms often fade and then come roaring back one or more times before it’s actually gone.

Most people can ride out a garden-variety stomach bug at home. Cyclospora is one of the cases where that instinct works against you. Get evaluated if:

• Diarrhea has lasted more than 3 days without improving
• You notice signs of dehydration — dark urine, dizziness, or noticeably less frequent urination
• Symptoms are severe or “explosive,” or come with significant cramping and fatigue
• Symptoms improve and then return
• You’re pregnant, immunocompromised, very young, or an older adult

You don’t need the ER for this. CityDoc’s four DFW locations are open seven days a week, no appointment necessary, and our providers can evaluate your symptoms in person or through a Video Visit and order the correct stool test if cyclospora is on the list of possibilities.

Diagnosis is based on a stool sample submitted specifically for Cyclospora testing.

Treatment is a course of prescription antibiotics. Certain antibiotics are effective against this specific parasite. Supportive care matters just as much while you’re recovering — staying hydrated with water or an electrolyte drink, resting, and eating what you can tolerate.

The good news: most healthy adults recover completely once they’re on the right treatment, and starting antibiotics earlier generally means a shorter illness overall.

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Here’s the part most people don’t know, and it’s exactly why this illness catches people off guard: standard stool testing doesn’t automatically check for cyclospora.

Texas DSHS guidance is specific about this: diagnosing cyclospora requires a stool sample submitted for “Ova and Parasite” testing with a specific order for cyclospora identification. It isn’t part of a routine stool panel.

In practical terms: if you go in with diarrhea and don’t specifically flag how long it’s lasted and how severe it’s been, there’s a real chance a standard workup won’t catch it. You’ll be sent home to “ride it out,” which for cyclospora can mean another two or three weeks of feeling sick instead of getting better in a few days.

Cyclospora season in Texas typically runs through August, so a few habits are worth keeping up for the next several weeks:

• Wash fresh produce thoroughly under running water — it helps, even though it isn’t a guarantee
• Cook produce when you can. Cooking kills the parasite, while washing alone may not
• Wash your hands with soap and water before and after handling or preparing food
• Keep cutting boards, countertops, and utensils clean between uses

If your “stomach bug” isn’t behaving like a normal stomach bug, don’t spend weeks feeling awful hoping it resolves on its own. Walk into any of CityDoc’s four DFW locations, no appointment necessary, or book a Video Visit from home.

• Uptown Dallas
• Preston/Royal
• Inwood Village
• Fort Worth

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