(LANSING) - Health officials are investigating a growing outbreak of cyclosporiasis across southeast Michigan and northwest Ohio.
The Michigan Department of Health and Human Services says 572 cases had been reported statewide as of Saturday, July 4. That is up from 170 cases reported on June 30.
Cases have been reported in Monroe, Lenawee, Lucas and Wood counties, with additional concentrations in several southeast Michigan counties.
Michigan counties with the highest reported case counts include Monroe, Lenawee, Washtenaw, Wayne, Shiawassee, Jackson, Oakland and Livingston counties.
Cyclosporiasis is an intestinal illness caused by the Cyclospora parasite.
Health officials have not identified a specific source for the current outbreak. Past outbreaks have been linked to contaminated fresh produce, including bagged salad mixes, pre-cut lettuce blends, cilantro, basil, raspberries, snow peas and green onions.
Lucas and Monroe county health departments are working together to trace possible exposure sources, including grocery purchases and restaurant visits in the weeks before people became sick.
Symptoms typically appear between two days and two weeks after exposure. They may include nausea, vomiting, diarrhea, fever and chills.
Health officials are urging people to wash produce thoroughly, remove outer leaves from leafy greens, rinse herbs under running water and use caution with produce that can be difficult to clean.
The investigation is ongoing. Health officials say anyone experiencing symptoms should contact a healthcare provider. The infection is typically treated with antibiotics and fluids.