Over 10,000 cases of cyclosporiasis, a gastrointestinal illness caused by the Cyclospora parasite, have been reported across Michigan in 2026. The state’s Department of Health and Human Services has linked the majority of cases to fresh produce but has not yet pinpointed a specific contaminated food item or distribution channel. Why it matters: Symptoms of cyclosporiasis include prolonged diarrhea, stomach cramps, nausea, and fatigue, sometimes lasting weeks if not properly treated. Michigan health officials are urging residents to thoroughly wash all fresh produce, especially leafy greens and berries, and to seek medical attention if symptoms are present. Zoom in: Local hospitals have reported an increase in patients treated for dehydration and related complications due to the illness.