How Worried Should Americans Be About Cyclosporiasis? Experts Weigh In
Summary
There has been a sharp increase in cyclosporiasis cases, a parasitic illness causing severe diarrhea, in several U.S. states, especially Michigan. Health experts and agencies are investigating the outbreak, but the exact source is still unknown, and federal tracking of the illness has been reduced since 2025.Key Facts
- Michigan has reported over 1,500 cyclosporiasis cases and 44 hospitalizations, far above its usual 50 cases per year.
- Other states with rising cases include Ohio (177), Illinois (141), New York (120), North Carolina (110), and Texas (48).
- The Centers for Disease Control and Prevention (CDC) reported 145 cases across 17 states from May 1 to June 16, 2026, but state reports suggest the real number is higher.
- The CDC's monitoring of foodborne illnesses like cyclosporiasis was reduced starting in 2025 under President Donald Trump’s administration.
- Cyclosporiasis usually increases from May through August, linked to eating fresh summer produce such as vegetables, herbs, and berries.
- Past outbreaks have been traced to contaminated fresh produce and multi-ingredient foods like salad mixes.
- Experts note that data and surveillance for this illness are less complete now than in previous years.
- Public health officials are working to identify the outbreak source but have not yet found a common food or exposure point.
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