Maryland has confirmed 69 cases of a parasitic stomach illness called cyclosporiasis, with cases more than doubling in the past week alone — and health officials say the outbreak is still growing.
What’s happening: Cyclosporiasis is caused by a tiny parasite called Cyclospora cayetanensis. It spreads when someone eats food or drinks water that has been contaminated with feces carrying the parasite. Past outbreaks have been tied to fresh produce including bagged salads, leafy greens, basil, cilantro, raspberries, and snow peas. The source of the current outbreak has not been identified.
By the numbers: Of Maryland’s 69 confirmed cases, 65 were reported between May 1 and July 14. As of July 14, 2026, the CDC has received reports of 1,645 confirmed domestic cases of cyclosporiasis across 34 states, with more than 5,100 additional cases requiring further analysis to confirm them as domestically acquired. Health officials say cases typically rise between May and the end of August each year.
Know the symptoms: According to the Maryland Department of Health, symptoms show up anywhere from one to 14 days after exposure — most often around a week. They can come and go for weeks or months without treatment. Watch for:
- Watery diarrhea, sometimes explosive
- Extreme fatigue and loss of appetite
- Stomach cramps, nausea, and vomiting
- Gas and bloating
- Substantial weight loss
- Low-grade fever
What this means for you: If you have severe or prolonged diarrhea, see a doctor and ask to be tested. A stool test is needed to confirm the infection. Drink plenty of fluids to stay hydrated.
How to protect yourself: The parasite does not wash off easily, but there are steps that reduce your risk:
- Rinse all fresh fruits and vegetables under running water before eating them.
- Cooking produce to 158 degrees Fahrenheit kills the parasite.
- Wash your hands with soap and water before and after handling food, after using the bathroom, and after changing diapers.
- Do not drink untreated water from lakes, streams, or springs.
What’s still unknown: Investigators have not yet identified the specific food source behind this outbreak.
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