# Michigan Cyclospora Outbreak Tops 2,600 Cases as Investigators Zero In on Lettuce
Health officials in Michigan are racing to trace the source of a rapidly expanding cyclosporiasis outbreak that has now sickened more than 2,600 residents, with early evidence pointing toward lettuce and salad greens as the likely culprit.
## Case Count Surges Far Beyond Normal Levels
The Michigan Department of Health and Human Services confirmed Monday that ,the outbreak has sickened 2,640 people, with early evidence pointing to lettuce or salad greens as a possible source., The scale of the outbreak is staggering compared to typical years — ,Michigan usually reports only 40 to 50 cases of cyclosporiasis each year, making the current outbreak unusually large.,
The illness isn’t confined to Michigan alone. According to CNN, ,the outbreak of diarrhea caused by the parasite cyclospora has risen to more than 3,000 cases across Michigan and Ohio combined,, suggesting the contaminated product may have traveled through a broader regional supply chain.
## Lettuce Emerges as Prime Suspect, But Mystery Remains
While the investigation is far from over, state health officials say a pattern has emerged repeatedly during patient interviews. ,The Michigan Department of Health and Human Services said Monday that while the investigation is ongoing, no specific type of lettuce, grower, or supplier has been identified, and other food items also have not been ruled out.,
Dr. Natasha Bagdasarian, the department’s chief medical executive, emphasized transparency with the public even without a confirmed culprit. ,”Although we do not have a definite product identified as the source of the outbreak, we want to let Michiganders know what we have learned so far so they can take steps to protect their families,”, she said. She added that ,early information has shown lettuce as a common product that regularly comes up during the investigation.,
Health officials have not been sitting idle. ,State health officials said they have completed more than 1,000 interviews with infected individuals while working with local, state, and federal partners to trace the source of the outbreak.,
## Why This Investigation Is So Difficult
Tracking down the exact source of a cyclospora outbreak is notoriously complicated, and experts say several factors are slowing this particular probe. According to CNN’s reporting, ,it’s difficult for investigators to pin down the source because cyclosporiasis cases are slow to be counted, may require patients to recall what they ate weeks earlier, genomic testing is complicated, and public health surveillance systems have recently faced funding cuts.,
Compounding matters, ,in 2025 the CDC scaled back one of its surveillance systems for foodborne illness — FoodNet, a partnership between the CDC, USDA, FDA and 10 state health departments that proactively searches for foodborne illness cases by contacting labs directly rather than waiting for reports., That means ,by the time a person is officially counted as a confirmed case and reported for follow-up, several weeks have often passed since the original exposure.,
Michigan officials acknowledged the challenge directly, noting that ,because symptoms can take up to two weeks to develop after exposure and food distribution networks are complex, the investigation could take time., Bagdasarian also called for stronger national cooperation, saying, ,”We really need that kind of coordination to happen at the national level.”, She added hope that ,as other states report their numbers to the CDC, health officials can take a broader look to determine whether outbreaks nationwide are connected.,
Officials have ruled out at least one common suspect. ,There is no evidence linking the outbreak to swimming or other recreational water activities,, keeping investigators’ focus squarely on contaminated produce moving through grocery stores and restaurants.
## What Consumers Can Do Now
Cyclospora is a microscopic parasite that infects the intestinal tract, and its symptoms can be miserable and long-lasting. The organism ,causes a diarrheal illness and is typically spread through food or water contaminated with feces., Left untreated, ,the illness may last from a few days to over a month, and symptoms can go away only to return one or more times.,
Until a definitive source is pinpointed, state health officials are urging households to take precautions with leafy greens. Recommendations include ,purchasing whole heads of lettuce rather than pre-washed, bagged lettuce or salad kits, and discarding the two or three outer layers of leaves before preparation., Officials also stress that ,heating food to 158 degrees Fahrenheit or higher kills the cyclospora parasite,, and that consumers should wash all produce thoroughly under running water even when peeling.
Anyone experiencing persistent watery diarrhea, nausea, or stomach cramps is urged to contact a healthcare provider, as the infection can typically be treated with antibiotics once diagnosed. As Michigan’s case count continues to climb and spreads into neighboring states, health officials say the coming weeks will be critical in finally identifying — and stopping — the source of this unusually severe outbreak.