Michigan Cyclosporiasis Outbreak: More Than 5,000 Cases Reported Across 17 Counties
Lindsay Knake
| 3 min read
Lindsay Knake is a brand journalist for Blue Cross Blue Shield of Michigan.
Michigan is experiencing a surge of an illness that causes diarrhea.
There have been more than 5,002 reported cases of cyclosporiasis across the state as of July 16, according to the Michigan Department of Health and Human Services (MDHHS). State and county health officials are investigating the source of the outbreak, which is confirmed in multiple counties in Michigan. Most cases are in Monroe, Lenawee, Washtenaw, Wayne, Livingston, Shiawassee and Jackson counties, and there are also reported cases in the city of Detroit. By comparison, Michigan usually has 50 reported cyclosporiasis cases per year.
This illness has been reported in people age eight to 84. The health department anticipates there will be more reported cases in coming days.
The outbreak in Michigan is part of a surge in cases in more than 30 additional states across the United States.
What is cyclosporiasis?
Cyclosporiasis is an intestinal illness caused by the parasite Cyclospora cayatenensis, which is spread by contaminated food or water contaminated with feces, per the U.S. Centers for Disease Control and Prevention (CDC). While the parasite and illness do not spread person to person, fresh produce has been a cause of the illness in the United States in recent years. The mild to moderate illness can last anywhere from a few days up to a month; however, it is usually not life-threatening.
What are the symptoms of cyclosporiasis?
Symptoms include:
- Frequent and sometimes explosive diarrhea
- Abdominal cramps
- Bloating
- Nausea and sometimes vomiting
- Loss of appetite
- Low-grade fever
Cyclosporiasis symptoms can be intermittent through the course of the illness.
If you have a sudden gastrointestinal illness, talk to your primary care provider (PCP). Antibiotics are a common treatment for cyclosporiasis, which can persist for several weeks if untreated for some people. The MDHHS is recommending physicians and health care providers consider cyclosporiasis as a reason for gastrointestinal illness in Southeast Michigan.
If you are looking for testing for cyclosporiasis, Blue Cross Blue Shield of Michigan covers non-proprietary PCR-based panel tests for gastrointestinal pathogens, including the BioFire GI Panel MID and QIAstat-DX Gastrointestinal Panel. Member cost sharing for these tests varies based on the individual's benefit plan, so out-of-pocket costs may differ among members. Laboratory tests that detect 12 or more gastrointestinal pathogens are not covered.
Those with the illness should drink plenty of fluids and get rest, according to the CDC.
What foods are linked to Cyclospora outbreaks?
While Michigan health officials are still looking for the cause of the 2026 outbreak, lettuce or bagged salad greens may be the source. Past sources of the Cyclospora cayatenensis in the U.S. include:
- Basil
- Cilantro
- Mesclun lettuce
- Raspberries
- Snow peas
- Sweet peas
How can you prevent cyclosporiasis?
To prevent contracting this illness, frequently wash your hands with soap and warm water, scrubbing for at least 20 seconds.
Because cyclosporiasis typically spreads through contaminated produce, the Michigan Department of Agriculture and Rural Development (MDARD) recommends taking the following steps to reduce your chance of contracting the parasite:
- Thoroughly wash all fruits and vegetables under running water before eating or cooking.
- Scrub firm produce such as melon with a clean produce brush.
- Remove damaged or bruised areas of produce before consuming.
- Refrigerate peeled, cut or cooked produce as quickly as possible.
Photo credit: Getty Images
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