Cyclosporiasis Cases Surge Across the U.S. with Over 1,500 in Michigan Alone

A parasitic infection causing severe diarrhea is rapidly spreading across the United States, with Michigan reporting over 1,500 cases in 2026—far exceeding the typical national annual count of a few hundred. New York State has identified about 500 cases, and Ohio reported 177 as of July 2. At least nine clusters exist nationwide, affecting Texas, Illinois, and Pennsylvania. The illness, cyclosporiasis, is caused by the microscopic parasite Cyclospora cayetanensis, which spreads through feces-contaminated food or water. Symptoms include watery diarrhea, explosive bowel movements, cramps, bloating, nausea, and extreme fatigue, lasting days to weeks. Diagnosis requires specialized stool tests, often leading to misdiagnosis as irritable bowel syndrome. Health officials are investigating the source, likely contaminated fresh produce such as raspberries, basil, cilantro, or salad mixes. Past outbreaks have been linked to farm-level contamination. The CDC notes national data lags behind state reports. Prevention includes thorough handwashing and produce washing; cooking kills the parasite. Experts advise against using dish soap on produce.