Michigan's parasitic Cyclospora outbreak exploded to 1,251 confirmed cases on July 9, 2026 — a jump of 259 cases in a single day — as state and federal investigators continued to search for the food source of what has become the largest Cyclospora outbreak in the state's recorded history, according to the Michigan Department of Health and Human Services.
The scale of what is unfolding is difficult to overstate. Michigan typically sees between 40 and 50 Cyclospora cases per year. The current outbreak, which began June 22, has already produced more than 25 times that annual total in fewer than three weeks, with no identified food source and no end point in sight as of July 10, 2026.
