Unidentified Parasite Emerges in 17 States — CDC Lacks Identified Source

The Centers for Disease Control and Prevention is monitoring 145 verified incidents of Cyclospora infection reported across 17 states in the U.S. since May 2026, with the source of contamination still unrecognized as health authorities conduct what is considered a possible outbreak inquiry. Cyclospora is a tiny intestinal parasite that can lead to extended episodes of diarrhea lasting for weeks if left untreated. Past outbreaks of Cyclospora have been associated with fresh produce items such as raspberries, basil, and pre-packaged salad greens, leading health officials to recommend that Americans ensure all fresh produce is thoroughly washed. Emergency room visits for gastrointestinal issues have seen a rise in the impacted states, although there have been no reported fatalities.