Michigan is dealing with a massive outbreak of cyclosporiasis — a diarrheal disease caused by the Cyclospora cayetanensis parasite. Over 700 cases have been reported since June 22, with 36 hospitalizations so far.
The numbers climbed fast. On June 30, the state reported 170 cases. By July 4, it was 572. Now it’s past 700. And the source? Still unknown.
Cyclospora spreads through contaminated produce and water. It causes watery diarrhea that can last a week or more. Dehydration is the main concern. Previous outbreaks have been tied to bagged salads, cilantro, basil, raspberries, snow peas, and green onions. But Michigan health officials haven’t pinned this one on a specific food yet.
The state’s investigation is focused on the southeastern region, where most cases are concentrated. They’re interviewing patients, looking for common exposures, and working with the CDC.
For context, Michigan usually sees around 50 cases a year. Their previous high was 97 in 2023. This year is already blowing past that by a mile. Nationally, the US sees between 2,000 and 5,000 cases annually.
If you’re in Michigan, wash your produce thoroughly. And wash your hands. That’s the basic advice, but it works.
