Michigan Cyclosporiasis Outbreak Exceeds 1,000 Cases

Michigan has confirmed over 1,000 cases of cyclosporiasis, marking the state's largest outbreak of the parasitic infection and one of the most significant in the United States in recent years. The outbreak, which began in May 2024, has primarily affected residents of the Detroit metropolitan area, though cases have been reported statewide. Cyclosporiasis is typically caused by the consumption of contaminated food or water, leading to symptoms such as watery diarrhea, loss of appetite, and fatigue that can persist for weeks.

Health officials are actively investigating the source of the outbreak, with preliminary findings suggesting a potential link to contaminated produce. The Michigan Department of Health and Human Services (MDHHS) has issued advisories urging residents to practice thorough handwashing and to wash all fruits and vegetables carefully before consumption. While no deaths have been reported in connection with this outbreak, the prolonged and debilitating nature of the illness has placed a strain on healthcare resources. The Centers for Disease Control and Prevention (CDC) is collaborating with state health departments to monitor the situation and identify common risk factors.

This outbreak underscores the ongoing public health challenge posed by foodborne illnesses. Cyclospora cayetanensis, the parasite responsible, thrives in warm, moist conditions and can contaminate various types of produce, particularly leafy greens and berries. Public health agencies emphasize the importance of robust food safety practices throughout the supply chain, from farm to table, to prevent future outbreaks. The investigation into the specific contaminated item or items is ongoing, with officials aiming to provide further guidance to the public once a definitive source is identified.