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Michigan Cyclosporiasis Outbreak Surpasses 10,000 Cases
Developing
In Short: Michigan has surpassed 10,000 cases of cyclosporiasis, with an additional 33 recent hospitalizations, as the outbreak spreads across 70 counties.
The Michigan Department of Health and Human Services reports that the state has surpassed 10,000 cases of cyclosporiasis, a disease caused by the parasite Cyclospora cayetanensis. The outbreak, first identified in Monroe County in late June, has now spread to 70 Michigan counties, with Wayne County reporting over 1,000 cases.
Health officials have noted a significant increase in hospitalizations, with 193 people requiring care, up from 160 on July 23. The numbers include 475 cases that were not previously reported due to delayed laboratory reporting, as of July 27.
Michigan typically sees around 50 cases of cyclosporiasis per year, making this outbreak unprecedented. Wayne County health officials warn that without treatment, the illness can last for weeks and may come and go. The source of the outbreak is believed to be lettuce or salad greens, though other foods are still under investigation.
Local health agencies, such as the Wayne County Public Health agency, are actively engaging with community residents through surveys to gather more information about the outbreak. Residents are encouraged to respond to these surveys to help identify possible sources of illness and protect public health.
Background
Michigan is a peninsular state in the Great Lakes region of the Upper Midwestern United States. It shares water and land boundaries with Minnesota to the northwest, Wisconsin to the west, Indiana and Illinois to the southwest, Ohio to the southeast, and the Canadian province of Ontario to the east, northeast and north.
What's confirmed
What's still developing
- Updated on: July 30, 2026 / 5:18 PM EDT / CBS Detroit An additional 33 Michigan residents have required hospital care for cyclosporiasis as an outbreak continues to be tracked, state health officials said on Thursday.
- Health officials say 193 people among those patients have been hospitalized, compared to the 160 hospital cases reported on July 23.
- The outbreak was first identified in Monroe County in late June and has since spread to 70 Michigan counties, with Southeast Michigan bearing the heaviest burden.
- Wayne County alone has reported more than 1,000 cases.
- Michigan sees around 50 cases of cyclosporiasis per year, according to MDHHS.
- The numbers reported on July 27 included about 475 cases that were "not previously reported to MDHHS due to delayed laboratory reporting," the agency said.
- "Without treatment, illness can last for weeks and may come and go," Wayne County health officials said.
- Michigan officials said on July 13 that testing pointed to lettuce or salad greens as a potential source, though other foods hadn't been ruled out.