Cyclosporiasis: Case rates rise in five outbreak states
Summary
Cases of cyclosporiasis, a food-related parasitic illness causing diarrhea, have been reported in at least 41 U.S. states, with infection numbers rising sharply in five states where the CDC declared an outbreak. The CDC reported 4,173 confirmed cases between May 1 and July 20, 2026, exceeding the total cases from 2025.Key Facts
- Cyclosporiasis is caused by a parasite that spreads through contaminated food.
- The CDC has declared outbreaks in Michigan, Ohio, Indiana, Kentucky, and West Virginia.
- Michigan has the highest number of confirmed cases, estimated at nearly 15 infections per 100,000 people.
- Ohio, Indiana, Kentucky, and West Virginia have lower but increasing infection rates.
- The CDC knows of at least 7,400 cases not yet confirmed by lab tests.
- Some sick people never get tested, so actual case numbers are likely higher.
- Iceberg lettuce is suspected as a main source of contamination in this outbreak.
- 2026 is on track to be the worst year recorded in the U.S. for cyclosporiasis infections.
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