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Cyclosporiasis Outbreak Spreads: 9 States Affected
24 Jul
Summary
- Largest known multi-state cyclosporiasis outbreak linked to iceberg lettuce.
- Over 11,500 cases reported this season, with 4,173 confirmed infections.
- Investigation is challenging due to lack of whole genome sequence for Cyclospora.
Federal health officials confirmed on July 24, 2026, that the largest known multi-state cyclosporiasis outbreak, associated with shredded iceberg lettuce, has now impacted nine states. This outbreak has become the largest ever recorded in the United States, with infections typically rising during warmer summer months.
As of July 24, 2026, a total of 11,500 cyclosporiasis cases have been reported this season. Of these, 4,173 infections have been confirmed, while approximately 7,400 additional reports are under evaluation. The nine affected states include Illinois, Indiana, Kansas, Kentucky, Michigan, Ohio, Oklahoma, Pennsylvania, and West Virginia.
Tracking the source of Cyclospora infections presents significant challenges for health officials. The Centers for Disease Control and Prevention notes that the absence of a whole genome sequence for the parasite complicates the investigation. Furthermore, outbreaks often involve foods with multiple produce ingredients, making it difficult to pinpoint a single source.
Michigan has notably recorded over 8,000 cyclosporiasis cases, representing a significant public health concern. Cyclosporiasis is caused by the parasite Cyclospora cayetanensis and is commonly linked to contaminated fresh fruits and vegetables. Health authorities continue to monitor cases and promote food safety practices to mitigate infection risks.
