Home / Health / Michigan Cyclospora Outbreak Soars Past 300 Cases
Michigan Cyclospora Outbreak Soars Past 300 Cases
4 Jul
Summary
- Michigan has confirmed over 300 cyclosporiasis cases, far exceeding the usual yearly count.
- The parasitic infection, causing severe diarrhea, is spreading across seven Michigan counties.
- Health officials are actively working to identify the source of the widespread outbreak.
A significant outbreak of cyclosporiasis, a parasitic infection, is rapidly spreading across Michigan, with health officials actively working to identify its source. As of Thursday, July 2, 2026, the state had confirmed more than 300 cases, a stark contrast to the usual annual average of around 50.
The infection has been detected in seven Michigan counties: Monroe, Lenawee, Washtenaw, Wayne, Livingston, Shiawassee, and Jackson. Cyclosporiasis, caused by the parasite Cyclospora cayetanensis, is typically transmitted through contaminated food or water and results in watery diarrhea, nausea, and stomach cramps.
While often mild, the illness can become severe, particularly for vulnerable populations. Health authorities are urging individuals with sudden, ongoing diarrhea to contact their healthcare providers. The Centers for Disease Control and Prevention has also reported cases in 17 other states nationwide since early May, though Michigan was not initially listed.
Nationally, over 1,000 cases of cyclosporiasis were reported in 2025. The Michigan Department of Health and Human Services is collaborating with state and local partners to determine the outbreak's origin as swiftly as possible.
