Michigan reports nearly 1,000 cyclospora cases as outbreak spreads to neighboring states

Michigan health officials have confirmed 992 cases of cyclospora infection, a parasitic illness that causes prolonged watery diarrhea, marking the state's largest outbreak in history. About 40 patients have been hospitalized. The outbreak, first identified in late June, appears to be concentrated in the southeastern part of the state, but similar cases have been reported in neighboring Ohio, where Lucas County recorded 306 infections and northwest Ohio more than 400.

The U.S. Centers for Disease Control and Prevention says 17 states have reported cases between early May and June 16, including Illinois, Maryland, Massachusetts, New York and Texas. The source of the current infections remains unknown, and investigators have not yet linked the illness to a specific food product.

"There is clearly a linked outbreak happening right now," said Dr. Natasha Bagdasarian, Michigan's chief medical executive, speaking to the Associated Press.

The Food and Drug Administration said its investigation is ongoing and that it is working with state partners, international regulators and industry stakeholders to monitor case counts and cluster activity.

Cyclospora spreads through fecally contaminated water or produce. Past U.S. outbreaks have been tied to bagged salad mixes, cilantro, basil, raspberries, snow peas and scallions, but no definitive source has been identified for the current surge. Experts note that detection of the parasite has improved in recent years, and climate factors may contribute to higher incidence.

Symptoms typically include frequent, sometimes explosive, watery bowel movements, abdominal cramping, nausea, fatigue and loss of appetite. Most patients recover without treatment, though antibiotics may be prescribed and hydration is essential. The CDC advises washing fresh produce thoroughly, removing outer lettuce leaves, and cooking vegetables when possible to reduce risk.

Public health officials emphasize that the situation does not constitute a national emergency, and there is no evidence that the parasite has become more transmissible.