Cyclosporiasis is rapidly spreading in the Midwest, including in Illinois, and while it is known for causing “explosive” diarrhea,” that’s not the only symptom people should watch for.
Cases of the parasitic infection are now soaring in the U.S., with infections skyrocketing in places like Michigan, with an unusually high number also reported in Illinois.
As of Monday, Illinois health officials said they were seeing “a higher-than-average number of reported cases” while Michigan health officials reported cases rose from 170 on June 30, 681 by July 6.
And the numbers could be even higher than reported.
The source of the surge in cases remains a mystery, however, as officials search for a potential link.
The Illinois Department of Public Health said “no single source or cause” has been identified so far, “and there is no evidence of a large outbreak accounting for all or most of these cases.” They are working with the Centers for Disease Control and Prevention to look for trends in recent cases.
“As of July 4, 2026, no specific produce grower/supplier, or specific produce type has been identified as the source of the outbreak,” the Michigan Department of Health and Human Services said.
While not usually life-threatening, the parasite infects people via contaminated food or water.
Health officials from both states, as well as the CDC, have noted that U.S. cases have previously come from contaminated produce and are urging residents to take extra precautions when cleaning fresh fruits, vegetables and herbs.
It can be particularly hard to identify as symptoms can appear between days and weeks of ingesting infected water or food.
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