(FOX 2) - Cases of Cyclosporiasis have grown over the weekend across Michigan and the United States.
Cyclosporiasis outbreak in Michigan
Big picture view:
Cyclosporiasis cases, the foodborne parasite known to cause "explosive diarrhea," are spreading across the U.S. Michigan is one of the states with the highest number of cases.
Health officials are still working to determine the source of the outbreak.
RELATED: Cyclosporiasis outbreak: How to wash produce
By the numbers:
As of Monday, July 13:
- 2,640 cases in Michigan
- 44 reported cases hospitalized
According to the Michigan Department of Health and Human Services (MDHHS), the 2,640 cases are up from 1,562 cases reported on July 10 and 1,251 from July 9.
Dig deeper:
As of July 13, 2026, no specific produce grower or supplier, or specific produce type has been identified as the source of the outbreak in Southeast Michigan, the MDHHS said.
They’ve detailed foods that have been previously linked to the illness:
- Bagged salad mixes and kits (pre-cut lettuce blends with romaine, iceberg, red cabbage, carrots)
- Fresh cilantro (coriander leaves)
- Fresh basil
- Raspberries
- Snow peas
- Green onions (scallions)
RELATED: Cyclosporiasis map: 29 states now investigating diarrheal illness
What you can do:
If you are preparing or eating any of the following raw foods, take the following steps to reduce the risk of exposure:
- Lettuce/leafy greens: Buy whole heads of lettuce (rather than prewashed, bagged lettuce or salad mixes), throw away the outer 2–3 layers of leaves and wash the inner leaves under running water. For leafy greens that can be cooked, cooking is the safest option.
- Cilantro, basil: Wash thoroughly under running water, separating the leaves. Safest when cooked.
- Raspberries: Their bumpy surface makes them especially hard to clean; the parasite can hide in the tiny crevices. Safest when cooked (pies, jams etc.). Consider frozen raspberries as an alternative (freezing may reduce but does not guarantee elimination of the parasite).
- Snow peas: Wash under running water and rub the surface. Safest when cooked.
- Green onions: Trim the root end and remove the outer layer, wash thoroughly under running water. Safest when cooked.
What is Cyclosporiasis?
Cyclosporiasis is a diarrheal illness caused by infection with the parasite Cyclospora cayetanensis, which experts say is found in developing countries and is spread by food or water contaminated with feces.
Outbreaks have occurred in the US as a result of eating contaminated fresh produce in hot weather.
It is not known to spread from person-to-person.
RELATED: Cyclosporiasis cases by state: Foodborne parasitic illness continues to spread
Cyclosporiasis symptoms
Timeline:
Symptoms occur two to 14 days after exposure and may include:
- Frequent watery diarrhea
- Loss of appetite and weight
- Abdominal cramps and bloating
- Nausea (vomiting is less common)
- Low-grade fever
Anyone infected who does not get treatment, health experts say the illness may last for a few days to over a month. Symptoms could go away and then return one or more times.
Cyclosporiasis treatment
If you experience sudden, ongoing diarrhea, reach out to your health care provider and your local health department.
Symptoms can be improved with an antibiotic.
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The Source: FOX 2 used information from The Michigan Department of Health and Human Services in this report.