Nearly 1,000 people in Michigan have gotten sick from a stomach parasite — and health officials still can’t tell you what food caused it.
Story Snapshot
- Michigan has confirmed 992 cases of cyclosporiasis, a parasite that causes severe, watery diarrhea, with 36 people hospitalized.
- Cases are concentrated in Monroe, Washtenaw, and Lenawee counties, but the illness has been reported across the state.
- Health officials strongly suspect contaminated produce but have not identified a specific food, grower, or supplier.
- The Centers for Disease Control and Prevention says there is no proof of a single, unified multistate outbreak — it may be several separate clusters.
A Parasite That Hits Hard and Fast
Cyclosporiasis is caused by a microscopic parasite called Cyclospora cayetanensis. It infects the small intestine and causes explosive, watery diarrhea, stomach cramps, nausea, and fatigue. Symptoms can last weeks if not treated. The illness is not spread person to person — people get it by eating or drinking something contaminated with the parasite. In past U.S. outbreaks, the source has often been fresh produce like bagged salad, basil, cilantro, or raspberries.
Michigan’s Michigan Department of Health and Human Services (MDHHS) reported 992 confirmed cases as of July 8, 2026, with 36 hospitalizations. The agency also noted a dramatic jump in positive tests: 15 out of 26 tests came back positive in 2026, compared to zero out of 36 tests the year before. That kind of spike is a strong signal that something in the environment changed — most likely a contaminated food supply hitting a concentrated area.
Where Cases Are Hitting Hardest
The outbreak is not spread evenly across Michigan. Monroe County leads with 173 cases, followed by Washtenaw County with 95 and Lenawee County with 86. That geographic cluster points investigators toward a shared food source — possibly a supplier or distributor serving those specific counties. State officials have been reviewing grocery store loyalty card data and interviewing patients to find a common thread, but no specific product has been confirmed.
The outbreak has affected people ranging in age from 8 to 84, with an average age of 44. That wide age range suggests the exposure is not limited to one type of setting, like a school or nursing home. It points more toward a widely available food item that many different households are buying and eating. Investigators are using whole genome sequencing — a method that maps the genetic fingerprint of the parasite — to try to match samples from sick patients to samples from suspect produce.
State and Federal Agencies Tell Different Stories
Michigan officials have emphasized that the outbreak spans 17 other U.S. states, framing it as a large, connected event. But the Centers for Disease Control and Prevention (CDC) pushed back on that framing. As of July 1, 2026, the CDC stated there is “no evidence of a single, multistate Cyclospora outbreak linking all cases,” describing the situation instead as multiple distinct clusters being tracked separately. That gap between state urgency and federal caution is creating confusion for the public trying to figure out how worried to be.
A rapidly expanding domestic outbreak of a resilient intestinal parasite is putting public health officials on high alert across the United States. The Centers for Disease Control and Prevention (CDC) is tracking a severe surge of cyclosporiasis, a foodborne illness caused by the… pic.twitter.com/n5nZmZd1sm
— Monroe (@Monroe1659842) July 9, 2026
What’s also frustrating is the absence of a food recall. Despite nearly 1,000 confirmed cases and 36 hospitalizations, no recall has been issued by the Food and Drug Administration (FDA) or the U.S. Department of Agriculture (USDA). Officials say they suspect contaminated produce but won’t name a specific item without proof. That’s a defensible legal position — but it leaves the public with no clear guidance on what to avoid. Past outbreaks linked to this same parasite have involved bagged salad mixes, fresh basil, cilantro, and raspberries, though none of those have been confirmed as the current source.
What You Can Do Right Now
Until a specific food is identified, health officials recommend washing all fresh produce thoroughly under running water before eating it. Cooking produce kills the parasite. If you live in southeast Michigan — especially Monroe, Washtenaw, or Lenawee counties — and you develop persistent watery diarrhea, cramping, or fatigue, see a doctor. Cyclosporiasis is treatable with antibiotics, but it won’t go away on its own. The sooner it’s diagnosed, the sooner you recover and the sooner investigators get one more data point to track down the source.
Sources:
washingtontimes.com, clickondetroit.com, michiganpublic.org, freep.com, michigan.gov, youtube.com, fox2detroit.com, pmc.ncbi.nlm.nih.gov