A surge of cyclosporiasis across American states is raising alarms, with Michigan reporting nearly 1,000 cases in what health officials are calling the worst outbreak in the state's recorded history. The microscopic parasite, transmitted through contaminated produce and water, causes debilitating gastrointestinal symptoms that can last weeks.
Michigan's outbreak dwarfs its typical annual caseload of about 50 infections. Ohio has reported 177 cases as of early July, while the CDC documented 145 cases across 17 states as of mid-June, though that count lags significantly behind what states are actually tracking on the ground.
The parasite cyclospora spreads when raw fruits, vegetables, and herbs come into contact with feces-contaminated water, typically during irrigation or handling. Health officials say the infection is seasonal, clustering in summer months from May through August. Past outbreaks have been tied to contaminated lettuce, raspberries, cilantro, basil, and spinach.
The hallmark symptom is relentless watery diarrhea marked by frequent, sometimes explosive bowel movements. Patients also report cramping, nausea, fatigue, appetite loss, and low-grade fever. The misery can stretch for several days or drag on for more than a month. Symptoms typically appear about a week after consuming contaminated food, though the window can range from two days to two weeks. Some infected people show no symptoms at all.
The illness is rarely fatal, and no deaths have been linked to the current outbreak. Most people recover without medical intervention, though antibiotics are the standard treatment. Those with compromised immune systems face higher risk of severe complications.
What makes this outbreak particularly concerning is that the source remains unknown. Investigators have not yet pinpointed which produce item or supplier is responsible. The 2022 Florida outbreak traced back to contaminated lettuce in packaged salad kits. A massive 1996 outbreak connected to Guatemalan raspberries sickened nearly 1,500 people across North America, while a 2019 outbreak tied to Mexican basil infected more than 2,400.
Health officials recommend thoroughly washing fresh produce under running water before eating, though they acknowledge that cyclospora can cling stubbornly to foods with texture, such as raspberries, blackberries, leafy greens, and fresh herbs. Cooking produce kills the parasite entirely. The CDC suggests consumers buy whole heads of lettuce rather than pre-washed bags, removing the outer two to three leaves and rinsing the rest under running water.
Author James Rodriguez: "An outbreak this size hitting Michigan suggests something in the food chain broke down badly, and regulators need to find the source fast before cases climb even higher."
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