Michigan Cyclosporiasis Outbreak: Food Safety Tips and Rising Cases

The Michigan Department of Health & Human Services has urged cooking certain foods amid a surge in Cyclosporiasis cases. This parasitic illness can cause severe diarrhea and is seeing a significant rise in Michigan, with 2,640 cases reported by July 13. Typically, the state encounters about 50 cases annually.

Recommended Food Safety Measures

The MDHHS has provided guidance for preparing five types of foods: leafy greens, cilantro, basil, green onions, snow peas, and raspberries. Cooking these items is safer, and thorough washing is essential. Raspberries, particularly challenging to clean due to their bumpy surface, can harbor the parasite in crevices. Cooking them into jams or pies or using frozen raspberries are alternatives.

For preparing green onions, trim at the root and remove the outer layer. When it comes to lettuce, purchase it whole and discard two to three outer layers before washing the inner leaves.

Expert Insight on the Outbreak

Ynés Ortega, an associate professor at the University of Georgia’s Department of Food Science and Technology, noted the involvement of berries and vegetables in previous outbreaks. She stressed the importance of washing fresh produce and preventing cross-contamination with cooked foods.

Current Outbreak Status

The outbreak is affecting multiple states:

• Michigan: Over 2,500 cases
• New York: 394 cases
• Ohio: 364 cases
• North Carolina: 205 cases
• Illinois: 141 cases
• Texas: 48 cases

As of July 10, the CDC reported 843 confirmed cases since May 1, 2026, and acknowledged many more under investigation. They are collaborating with states to update figures and address discrepancies between national and state reports.

Ortega highlighted the annual occurrence of Cyclospora-related illnesses in the US. Authorities, including the CDC and FDA, are actively searching for this year’s infection source.

Symptoms and Medical Advice

Symptoms arise about a week after consuming contaminated food or water, but onset can vary from two days to two weeks. The infection causes various symptoms:

• Frequent and severe diarrhea
• Severe stomach cramps and bloating
• Nausea and appetite loss
• Prolonged fatigue and weight loss

Health officials advise seeking medical attention and requesting specific testing for the parasite if experiencing prolonged gastrointestinal issues.