
On October 2, 2026, FDA closed its investigation of the Cyclospora outbreak linked to shredded iceberg lettuce from Taylor Farms de Mexico. The final count is 12,883 illnesses in 21 states, 570 hospitalizations and two deaths, with the last illness beginning on August 17. CDC declared the outbreak over on September 11. Today’s update is the first time FDA has said what its inspectors found in Mexico, and it is the first laboratory finding from the growing and processing environment in this outbreak.
FDA’s traceback identified several farms and one processing facility in Mexico that supplied the recalled lettuce. Investigators inspected and sampled multiple growers and the plant in coordination with Mexican officials, collecting water, soil, sediment and lettuce. Two samples tested positive for Cyclospora. One came from a tank holding outgoing wastewater at the Taylor Farms de Mexico processing facility. The other came from a drainage ditch at an iceberg lettuce grower identified in the traceback. No lettuce sample tested positive. The only product positive ever announced, a border sample on July 18, was withdrawn as a false positive the next day.
FDA also said what the two positives do and do not show, and it deserves credit for saying it plainly. They show the parasite was present where the lettuce was grown and processed, and they add to the epidemiology and the traceback that pointed at this lettuce in July. They do not show how the contamination happened. FDA says there is not enough evidence to determine that. Genotyping of both samples is complete, and FDA is still working out how those results relate to the genotyping of specimens from sick people.
The last time FDA sampled this operation
In 2013, after a Cyclospora outbreak that sickened 631 people in 25 states, FDA and five Mexican agencies conducted an environmental assessment at Taylor Farms de Mexico in Guanajuato. By my reading of that assessment, about 835 samples of lettuce, water and worker stool were tested and none was positive. The one sample that could not be read was recycled wash water from inside the plant, too turbid for the filtration method. FDA could not determine how or where the parasite got into the product. Taylor Farms said it would test its water. Thirteen years later I could not find one public result. I have written about the two federal documents and about this company’s outbreak and recall record since 2009.
Put the two investigations side by side. In 2013, the one sample the method could not read was water inside the plant. In 2026, one of the two positives was water leaving the plant, and the other was water beside a field. FDA moved its sampling upstream this time, from the plant to the growers, which it announced on August 20, and a field is where a waterborne parasite gets onto lettuce. A positive in a wastewater tank is water that has already washed lettuce. It does not tell you whether the parasite arrived on the leaves or in the building. It tells you it went through the building.
Two statements from this summer belong next to that. On July 17, Taylor Farms said FDA’s tracing indicated that a specific independent farm in Mexico was responsible. FDA now says its traceback identified several farms and the processing facility, and the positives came from a grower and from the plant’s own wastewater. In August the company told the New York Times that it runs a fecal indicator testing program covering all of its water sources and that every test had been negative. Indicator tests look for bacteria, not for this parasite. FDA’s own method for Cyclospora in agricultural water looks for the parasite itself, and a sample reported positive for Cyclospora can only come from a test that does. Negative indicator results on incoming water and a positive parasite result on outgoing water are not in conflict. They are two different questions, and only one of them is the right question.
The sentence everyone is waiting for
On August 20, CDC said genotyping showed the parasites from sick people were genetically related to one another, which closed off the argument that this summer was unrelated cyclosporiasis piling up at once. It did not tie anyone to the lettuce. Today FDA says the two environmental samples have been genotyped and it is still analyzing how they relate to the clinical results. That is the comparison that matters. If the parasite in the wastewater tank and the ditch matches the parasite in the patients, the loop that 2013 never closed is closed. If it does not match, that is worth knowing too. FDA should say which, and say when it will say.
What FDA says comes next
On September 11, the day CDC closed the outbreak, FDA posted a page titled Post-Outbreak Response Activities. It lists a meeting with Mexican officials the week of September 8 about a prevention framework, a continuing root-cause investigation, a letter to industry, and a promise to fold lessons learned into the Cyclospora Prevention, Response and Research Action Plan in the coming months. Today’s update says that page will also carry prevention activities planned before the 2027 growing season. The letter, signed September 11 by Donald Prater, the acting deputy commissioner for food, reminds growers, packers, importers and retailers of rules already on the books and asks every link in the supply chain to develop new science-based practices against this parasite. The Action Plan it points to was written in 2021, and its page was last updated on June 30, 2023. It opens by describing roughly 3,000 domestically acquired cases over three years. CDC confirmed 19,883 this season as of its September 15 update.
Of those 19,883, 12,883 are in this outbreak. Roughly 7,000 confirmed cases have no food named, and FDA’s own outbreak table still carries four Cyclospora files, 313 people in all, where the outbreak has ended and no food was ever identified. The National Advisory Committee on Microbiological Criteria for Foods, which FDA charged in 2021 with the research questions the letter now hands to industry, delivered its Cyclospora report in 2023 and was terminated in 2025.
Before the first head of lettuce goes in the ground for 2027
Say whether the genotypes match. The environmental results exist. Compare them to the patients, publish the answer, and put a date on it.
Publish the root-cause findings. Which farms, how the water was used and treated, what the soil and sediment showed, and what was found at the plant. FDA published the 2013 assessment. It should publish this one.
Test water for the parasite, not for a stand-in. FDA has a method for Cyclospora in agricultural water. The pre-harvest water rule names no parasite. Name it, and say what a grower is supposed to do with a positive.
Records in twenty-four hours. Michigan asked Taco Bell for its supplier list on July 1, July 3 and July 6, and FDA had complete records on July 13. The traceability rule that would have required an answer in a day was delayed to 2028, and Congress then barred FDA from spending a dollar to enforce it before then. FDA can ask Congress to unwind that, and the part of industry that is already compliant can ask with it.
Inspect on a schedule, not after an outbreak. Before this summer, as the Times reported, FDA had last visited the Doctor Mora plant in 2019. A grower that ships to thirty-one states should expect a visit more often than once in seven years.
Say what the 7,000 are. If the clusters cannot be solved, say that, and say what would have been needed to solve them.
Marler Clark represents hundreds of people sickened in this outbreak and has filed suits in Ohio, Michigan, Kentucky and Illinois.
FDA found the parasite in the water this time. In 2013 it could not read the water, and nothing public ever came of the promise to test it. The difference between those two years is a sample result and a page that says what it means. The difference between this year and next will be whether anybody is required to do anything about it before the 2027 lettuce is planted.










