More than 300 people in southeast Michigan have been diagnosed with Cyclosporiasis — a parasitic intestinal illness — since June 22, 2026. The count was 170 on July 1 and jumped to more than 300 by July 3, an increase of 130 cases in 48 hours. Health officials have called it a "large and growing outbreak," and no food source has yet been identified.
The Michigan Department of Health and Human Services confirmed the outbreak in Monroe, Lenawee, Washtenaw, Wayne, Livingston, Shiawassee, and Jackson counties — with an additional 24 cases across 11 other Michigan counties, including the city of Detroit. The typical annual count for all of Michigan is around 50 cases. This outbreak has already produced six times that number.
