CDC Closes the Largest Cyclospora Outbreak in U.S. History — 12,883 Illnesses, Two Dead, Root Cause Still Unnamed

CDC Closes the Largest Cyclospora Outbreak in U.S. History — 12,883 Illnesses, Two Dead, Root Cause Still Unnamed

Federal health officials have closed the largest Cyclospora outbreak ever recorded in the United States — and closed it without a publicly established root cause.

The final tally: CDC declared the outbreak over on September 11, 2026, about three and a half weeks after the last reported illness onset in August. The final count: 12,883 illnesses across 21 states, at least 570 hospitalizations, and two deaths, both in Michigan. Illnesses linked to the outbreak began June 14. The CDC's final investigation update tied the illnesses to iceberg lettuce sourced from central Mexico and recalled by Taylor Farms de Mexico, adding one more state (Virginia) to the tally before closing.

Open questions remain: the FDA's own investigation into the supplier "remains open, along with inquiries into other Cyclospora clusters that surfaced this summer, meaning the root cause of the contamination has not been established publicly." FDA began on-site inspections and sample collection at Mexican lettuce growers on Aug. 20, and senior FDA and Mexican officials met the week of Sept. 8 on a prevention framework for produce grown in Mexico. Across the May-to-September investigation period, CDC reported 19,595 laboratory-confirmed cyclosporiasis cases acquired in the U.S. — a figure that includes the lettuce outbreak plus separate clusters.

The produce-safety reckoning: FDA's Office of Produce Safety's Donna Garren told state agriculture officials the outbreak "should be a moment of reckoning for FDA," saying the summer exposed a food safety system that "does not always reflect the complexity of today's global supply chain," and calling for reinstating a national produce microbiological testing program similar to USDA's former Microbiological Data Program. Context that sharpens the point: the Associated Press found FDA inspections of foreign food sites are down nearly 35% since 2019¹, and the International Fresh Produce Association closed its outbreak page Sept. 14 noting the finding rested on epidemiology and traceback rather than a positive laboratory test. As food-safety lawyer Bill Marler put it in his weekend column: "closed is not the same as answered."

What it means: a record-shattering foodborne outbreak — nearly 13,000 sickened from one commodity — has ended with the contamination pathway still unexplained and the industry disputing the evidentiary basis. The policy fight now is whether the outbreak forces a rebuild of produce surveillance (national testing, naming firms tied to outbreaks) or gets filed away with the summer.