Cyclosporiasis cases in Michigan surge past 3,300

Ben Warren, The Detroit News on Jul 14, 2026

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DETROIT — The number of cyclosporiasis cases in Michigan now tops 3,300, according to an update Tuesday morning by the Michigan Department of Health and Human Services.

Tuesday's case total of 3,309 is up from 2,640 as of Monday. A total of 44 people had been hospitalized as of July 9.

The illness, which causes diarrhea and cramping, is caused by the parasite Cyclospora cayetanensis. While the source of the outbreak has not yet been identified, the state health department said in a statement that lettuce or salad greens may be the culprit.

Where are cyclosporiasis cases concentrated in Michigan?

Most cases of cyclosporiasis have been detected in Southeast Michigan, but counties in the northern Lower Peninsula and even the Upper Peninsula have seen a few cases.

Most cases of the more than 3,000 cases are concentrated in Southeast Michigan, with at least 339 cases in Wayne County, at least cases in Monroe County, at least 290 cases in Washtenaw County and at least 258 cases in Monroe County as of July 13.

Overall, cases have been identified in 56 Michigan counties.