US officials investigate outbreak of parasitic illness
US officials investigate outbreak of parasitic illness
Updated at: July 17, 2026 at 06:15 AM
US health officials are currently tracking an unusually high number of cases of cyclosporiasis, a gastrointestinal illness caused by the Cyclospora cayetanensis parasite.
With over 1,600 cases confirmed across more than 30 states, 2026 is on track to be one of the worst years for this infection on record.
The Midwest and Northeast are experiencing the highest impact, with Michigan facing its largest outbreak ever.
While investigations are ongoing, officials suspect that contaminated lettuce and leafy greens may be the source of the parasite.
Symptoms typically include explosive watery diarrhea, cramping, and fatigue, which can last for weeks.
Because the parasite cannot be cultured in a laboratory, tracking the source is exceptionally difficult for researchers.
Health authorities recommend thoroughly washing all fresh produce and suggest avoiding pre-mixed salad kits for now.
If you experience prolonged stomach issues, it is important to visit a doctor and specifically request testing for Cyclospora, as it is often absent from routine medical tests.
