Michigan Cyclosporiasis Outbreak Nears 1,000 Cases as Ohio Reports 177

Q: Did a 2025 CDC policy change leave America vulnerable to this massive parasitic outbreak?

Not definitively, but it may have weakened early detection. The key 2025 change was that, starting in July, CDC’s FoodNet made tracking of *Cyclospora* optional rather than part of its required active surveillance. Experts cited in reporting said that could make outbreaks harder to spot quickly, especially for a parasite that is already difficult to trace because symptoms appear one to two weeks after exposure, testing is not routine, and patients often cannot recall what they ate. That said, the policy change did not end U.S. surveillance. Cyclosporiasis remains a nationally notifiable disease, and the CDC says other reporting systems still track it. State health departments, the CDC and the FDA are still investigating clusters in multiple states. So there is not clear evidence that the 2025 change caused the current surge. What is clear is that the outbreak exposed existing weaknesses: reporting delays, undercounting, limited lab capacity, and the complexity of tracing contaminated produce. The CDC itself has acknowledged that current national case counts are a substantial undercount. Those problems likely matter as much as, or more than, the FoodNet change alone. So the fairest answer is that the 2025 policy shift may have reduced one layer of active surveillance and potentially made outbreak recognition slower, but the available evidence does not prove it left the country vulnerable by itself or directly caused the 2026 cyclosporiasis surge.

3 articles · Updated · The Guardian · Jul 9

Nearly 1,000 Michigan cases have made the cyclosporiasis outbreak the largest in state history, far above the roughly 50 cases Michigan typically records in a year.
Ohio has also logged 177 cases as of July 2, while CDC data showed only 145 cases across 17 states as of June 16, indicating federal figures are lagging well behind state reporting.
Health officials have not identified the source, but cyclospora usually spreads through raw produce or water contaminated with human feces and tends to spike in the US from May through August.
No deaths have been linked to the outbreak, though some patients have been hospitalized and symptoms can include prolonged watery diarrhea, cramps, nausea and fatigue.
Past US outbreaks have been tied to contaminated lettuce, basil and berries; officials now advise washing produce carefully, favoring whole lettuce heads over bagged mixes, and cooking vegetables when possible.