The Michigan Department of Health and Human Services said the two individuals who died had underlying health conditions, and their illnesses were likely affected by intestinal infection and dehydration caused by Cyclospora. The agency did not identify the decedents or provide ages or locations within the state.
Health authorities emphasized that Cyclospora cayetanensis is a microscopic parasite that can cause cyclosporiasis, an intestinal illness characterized by watery diarrhea, loss of appetite, weight loss, stomach cramps, nausea, and fatigue. Symptoms typically begin a week or more after exposure and can persist for weeks if not treated. Treatment usually involves antibiotics prescribed by a healthcare provider, along with rehydration.
Officials did not specify the source of the outbreak, noting that the investigation is ongoing. Cyclospora is often linked to contaminated produce, including leafy greens, berries, and herbs, but pinpointing a single supplier can be challenging in multi-state or multi-country outbreaks. Health departments across the region are conducting case interviews and tracing potential food exposures, while public health advisories underscore the importance of washing produce thoroughly and washing hands after handling raw produce.
The announcement comes as the broader health response continues to monitor for additional cases and to guide medical providers on recognizing and treating cyclosporiasis promptly. Public health officials reiterated that people who experience prolonged diarrhea (lasting more than a few days) or symptoms such as fever, vomiting, or dehydration should seek medical care, as early treatment can prevent complications.
Michigan’s confirmation of the first U.S. Cyclospora-linked deaths highlights the seriousness of the outbreak and the need for ongoing surveillance and consumer awareness while investigations continue to identify the contamination source.