Cyclosporiasis Parasite Outbreak Grows to 1,562 Cases in Michigan
A parasitic infection called cyclosporiasis is spreading rapidly across Michigan, with over 1,500 confirmed cases reported as of July 9, 2026. Health officials suspect fresh produce contamination and are urging preventative measures as investigations continue.
Outbreak Scale
As of the latest count, Michigan has reported 1,562 total cyclosporiasis cases, with 44 cases requiring hospitalization. The cyclosporiasis cases have been reported from June 22 through July 9, 2026. This represents one of the largest parasitic foodborne illness outbreaks in recent U.S. history.
Disease Characteristics and Transmission
Cyclosporiasis is a type of food poisoning that can cause severe diarrheal illness but isn't usually life-threatening, with the latest spike in Michigan having health officials on high alert. The source of the outbreak has not been identified, and MDHHS continues to work with local health departments and partners to investigate cases, though fresh produce is suspected.
Investigation and Prevention
Cyclosporiasis is treated with antibiotics along with rest and drinking plenty of fluids to maintain hydration. Health authorities recommend purchasing whole heads of lettuce rather than prewashed, bagged lettuce or salad mixes as a precautionary measure. People experiencing gastrointestinal illness, such as sudden and ongoing diarrhea, are encouraged to contact their healthcare provider for testing and treatment.
Public Health Response
State health officials have intensified investigations into the source of contamination while advising Michigan residents to exercise caution with fresh produce. The outbreak highlights ongoing food safety challenges and the importance of supply chain vigilance in preventing parasite transmission to consumers.