The Michigan Department of Health and Human Services reported Friday that the state's outbreak of cyclosporiasis has reached 1,562 confirmed cases since late June, with 44 people hospitalized as health officials continue an active investigation.
Scope and geography
Most infections are concentrated in Southeast Michigan. As of July 9, health departments have confirmed cases in 40 counties. Monroe County has reported the highest county total so far, with 215 cases. Other counties with reported cases include Jackson, Lenawee, Livingston, Oakland, Shiawassee, Washtenaw and Wayne.
| Metric | Value |
|---|---|
| Total confirmed cases | 1,562 |
| Hospitalizations | 44 |
| Counties with cases | 40 |
| Most affected county | Monroe (215) |
| Michigan annual average (pre-outbreak) | ~50 cases/year |
What is cyclosporiasis and symptoms to watch for
The illness is caused by the parasite Cyclospora cayetanensis and typically produces gastrointestinal symptoms. Health officials say common signs include frequent watery diarrhea, decreased appetite, bloating, nausea and fatigue; some people also report body aches, headaches or vomiting. Symptoms may begin days to weeks after exposure.
Investigations and likely sources
State and federal investigators, including the Centers for Disease Control and Prevention, are working to determine what is prompting the recent surge. Officials have not yet identified a single cause, supplier or grower tied to Michigan's cases.
Investigators typically look for links to fresh produce. In past U.S. and Canadian outbreaks, implicated items have included bagged salad mixes, fresh cilantro, basil, raspberries, snow peas and scallions. Given those patterns, Michigan health authorities are advising extra care in handling fresh produce, especially in commercial kitchens and restaurants in Southeast Michigan.
Prevention advice for residents and food businesses
MDHHS has set up an outbreak webpage with daily case-count updates by 11 a.m. Eastern. The state also provides regular hospitalization and outbreak detail updates on Thursdays.
- Wash fruits and vegetables under clean running water before eating or preparing them; do not rely on produce washes to kill parasites.
- When possible, cooking produce reduces the risk of infection.
- Restaurants and institutional kitchens should take extra precautions handling fresh produce and review their procedures for washing, storage and staff hygiene.
- If you become ill with persistent diarrhea, seek medical care; stool testing is required to confirm cyclosporiasis.
Officials note that cyclospora is not spread directly from person to person in most cases; the parasite is usually transmitted by ingesting contaminated food or water. Michigan's outbreak, beginning in late June, represents a significant increase over the state's typical annual case load, underscoring the ongoing public-health response.
Residents who are concerned about symptoms or exposure can consult the MDHHS outbreak page for the latest counts and guidance, and contact their local health department for testing and treatment information.
