Michigan’s cyclosporiasis total rose to 8,176, up 512 from the 7,664 cases reported on July 23, as health authorities tracked a rapidly expanding outbreak of the parasitic illness. The state had the largest reported caseload in the United States during the summer of 2026.
The Michigan Department of Health and Human Services said 160 residents had received hospital treatment as of July 23. That figure had increased from 102 on July 16 and 44 on July 9. Case totals were being updated each weekday, while hospitalization numbers were reported weekly on Thursdays.
State and local officials first recognized the Michigan outbreak in Monroe County in late June. By July 24, nearly every county had reported at least one case. Wayne, Ingham, Oakland, Monroe and Washtenaw were among the most affected. Michigan ordinarily records around 50 cyclosporiasis cases per year, making the 8,176 total far outside its normal annual pattern.
Cyclospora cayetanensis causes the illness and spreads when contaminated faecal matter reaches food or water. Symptoms generally begin about a week after exposure and include frequent watery diarrhoea, reduced appetite, bloating, nausea and fatigue. They can persist for two weeks or longer, and untreated illness can continue or recur for weeks.
Federal authorities said multiple clusters were active across the country. Forty-one states had reported cases, although the Centers for Disease Control and Prevention used a confirmation process that lagged behind Michigan’s count. For illnesses from May 1 through July 21, the CDC listed 4,173 laboratory-confirmed cases and another 7,400 reports under investigation, many of them from Michigan and Ohio.
Lettuce was part of the tracing work. Michigan officials had said lettuce or salad greens were a possible source, while other foods remained under review. The Food and Drug Administration later said a lettuce sample from Taylor Farms initially described as positive for Cyclospora was actually a false positive. That result left the broader investigation open.
U.S. Health and Human Services Secretary Robert F. Kennedy Jr. said on July 21 that the outbreak was under control and rejected suggestions that monitoring cutbacks had weakened food safety. The continued increase in Michigan’s reports nevertheless showed substantial case processing at state level.
No single product, grower or supplier was established as the source of all Michigan illnesses in published findings. The 8,176 figure therefore documented the scale at that point while testing, interviews and traceback efforts continued across several potentially separate clusters.
The federal confirmed and under-review categories could not be added directly to the state count because the systems overlapped and applied different validation schedules. Michigan was reporting faster than the CDC. Any national total built by simply combining them would risk counting the same patients twice, which is why each authority published its own series.
