Key keywords: Michigan cyclosporiasis outbreak 2024, cyclospora infection source traceback, Michigan Department of Health and Human Services, foodborne parasitic infection, cyclosporiasis symptom guidance, Midwest foodborne illness outbreak, fresh produce contamination risk As of the latest official update released by the Michigan Department of Health and Human Services (MDHHS) on Thursday, the ongoing statewide cyclosporiasis outbreak has reached 721 confirmed cases, marking a 24% jump from the case count reported just 7 days prior, making it the largest cyclospora outbreak recorded in Michigan over the past 12 years. Cases have been documented across 42 of Michigan’s 83 counties, with the highest infection clusters concentrated in Oakland, Wayne, Kent, and Macomb counties, which collectively account for 64% of all confirmed diagnoses. Roughly 9% of infected individuals have required hospitalization for severe dehydration and gastrointestinal complications, though no outbreak-related fatalities have been reported to date. Cyclosporiasis is an intestinal parasitic infection caused by the Cyclospora cayetanensis parasite, which spreads exclusively through consumption of food or water contaminated with trace amounts of infected human feces. Common symptoms include frequent watery diarrhea, sharp abdominal cramping, unintended weight loss, extreme fatigue, nausea, and low-grade fever, which typically appear 1 to 14 days after exposure to the parasite. Without targeted antibiotic treatment, symptoms can persist for weeks or even months, and may recur in vulnerable groups including young children, the elderly, and immunocompromised individuals. MDHHS epidemiologists are currently collaborating with teams from the U.S. Centers for Disease Control and Prevention (CDC) and the U.S. Food and Drug Administration (FDA) to pinpoint the root cause of the outbreak. Investigators are collecting detailed food exposure surveys from confirmed patients to identify common food items consumed in the two weeks before their symptoms began, as well as cross-referencing supply chain records for grocery chains and food service locations across the state. Officials note that past cyclosporiasis outbreaks in the U.S. have most frequently been linked to imported fresh produce including leafy greens, basil, cilantro, berries, and pre-cut fruit mixes, though no specific food item has yet been officially tied to the current Michigan outbreak. Public health officials are urging all Michigan residents to thoroughly wash all fresh produce under running water before consumption, even if the product is labeled pre-washed, and to seek medical care immediately if they experience persistent diarrhea lasting longer than three days. Residents who have been diagnosed with cyclosporiasis in the past month are also asked to respond to outreach from local health departments to help speed up the source investigation.