Here is the sentence that should stop every foodservice operator cold: there is no rinse, no chlorine wash, and no post-harvest process in commercial use that removes Cyclospora from lettuce. If it arrives contaminated, it stays contaminated — and it lands on the plate.
That is the message food safety lawyer Bill Marler is carrying to New Orleans this week, as a nine-state Cyclospora outbreak traced to shredded iceberg lettuce from Taylor Farms de Mexico and served at Taco Bell restaurants climbs to 1,947 confirmed illnesses.
What the Federal Numbers Show
As of July 24, 2026, FDA and CDC put the named outbreak at 1,947 illnesses and 98 hospitalizations across nine states: Illinois, Indiana, Kansas, Kentucky, Michigan, Ohio, Oklahoma, Pennsylvania and West Virginia.
But the named outbreak does not describe the full season. CDC's surveillance page counted 4,173 laboratory-confirmed domestically acquired cases as of July 21, across 41 states, with 308 hospitalizations — and CDC is aware of more than 7,400 additional cases not yet laboratory confirmed, most of them in Michigan and Ohio.
Add what individual states are posting on their own dashboards and the floor climbs to roughly 15,500. The scale becomes clear at the state level:
- Michigan alone has reported 8,176 cases and 160 hospitalizations.
- Michigan normally sees about 50 Cyclospora cases a year.
- Over the comparable window last year — May 1 through mid-July — CDC recorded just 249 domestically acquired cases nationwide.
Why Washing the Lettuce Doesn't Work
Marler, managing partner of Marler Clark and a food safety lawyer since the 1993 Jack in the Box E. coli outbreak, is in New Orleans for IAFP 2026, the annual meeting of the International Association for Food Protection, with a single argument about why this outbreak happened — and why it will happen again.
The core problem: there is no validated kill step for Cyclospora on ready-to-eat produce.
- Washing is partial at best. A 2021 study in Foods found that a minute under cold running water removed at least 80% of two other parasites but only 39% of Cyclospora from raspberries — and no method removed all of it.
- Chlorine does not work. That is FDA's own position, written for farmers: chlorine and other common anti-microbial chemical treatments are not effective against C. cayetanensis.
- Heat works — but heat destroys lettuce. There is no way to apply a thermal kill step and still sell a crisp shredded product.
The parasite cannot even be grown in culture, so every industry control built for leafy greens targets bacteria and ends in a chemical intervention this organism swims straight through.
"Every process this industry validated, was validated against bacteria. Cyclospora is not a bacterium, and the chemistry that kills E. coli does nothing to it — FDA says so in its own fact sheet. If you cannot make contaminated lettuce safe, then the entire answer is keeping it from being contaminated in the first place." — Bill Marler
The Real Control Point Is Water
Cyclospora has one reservoir, and it is the human gut. When it turns up on lettuce, human feces reached that lettuce — or the water that grew it. That makes water the control point, and, according to Marler, it is not being controlled for this parasite.
Dr. Mark Moorman, until recently the director of FDA's Office of Food Safety, told CNN this week that investigators have never definitively identified the cause of a Cyclospora outbreak — not one, in thirty years — and that no law or rule requires a farm to test its irrigation water or its produce for it. Testing is voluntary, and he said FDA does not have that lever.
Microbiologist Jennifer McEntire, in the same reporting, put the mechanism plainly: water is the number one route, and the open question is how human waste gets into it — portable toilets emptied in the field, a leaking septic tank, a sewer that overflows after heavy rain.
The Mandate Exists — It Points the Wrong Way
The California and Arizona Leafy Greens Marketing Agreements (LGMAs), covering better than 90% of domestic leafy greens, already require growers using surface water for overhead irrigation to treat that water in the 21 days before harvest.
But read what the requirement asks for and it is an EPA-registered antimicrobial, validated and verified, with success measured by generic E. coli — chlorine-family chemistry, selected for bacteria, scored by a bacterial indicator. Microfiltration, ozone and ultraviolet treatment — the interventions FDA names for regions where the parasite is endemic — are required of no one.
And the field at the center of this outbreak is in Guanajuato, which no LGMA metric reaches at all.
"Water treatment is already mandatory in the leafy greens industry. It is just aimed at the wrong organism. We are testing for generic E. coli, which FDA states will not identify this parasite, while human-specific fecal markers that would identify the exposure sit unused. The mandate exists. It points the wrong way." — Bill Marler
A Familiar Facility
This is not the first time the same facility has been at the center of a national outbreak. FDA traced the 2013 Cyclospora outbreak in salad mix to Taylor Farms de Mexico's plant at Doctor Mora, Guanajuato — the same facility implicated this summer.
The environmental assessment FDA and COFEPRIS conducted then covered the processing plant and five ranches, and its second recommendation told the firm to determine whether Cyclospora was a reasonably likely hazard in that growing region and, if so, to re-evaluate the wash step. Thirteen years later, no public document shows that determination was ever made.
Roughly 800 feet from that processing building sits Balneario Las Fajanas, a public thermal-water bathing complex with pools, slides, showers and changing rooms, open every day of the year and visible in satellite imagery.
Why It Matters
For restaurant operators, foodservice executives, and procurement directors, this outbreak reframes a comfortable assumption: that a spec sheet and a supplier's food safety program cover you on ready-to-eat produce. For Cyclospora, they may not — because the controls your suppliers point to were built for bacteria, and this parasite is untouched by the chemistry those controls rely on.
Practical takeaways for buyers and operators:
- Ask sharper supplier questions. Don't accept "our water is treated" at face value. Ask specifically what the treatment targets, whether it is validated against Cyclospora, and whether the grower monitors for human-specific fecal markers — not just generic E. coli.
- Know your sourcing geography. LGMA requirements do not reach every growing region. If your leafy greens originate outside LGMA coverage, the assurances you assume may not apply.
- Understand that "washing" is not a control. Instructing staff to rinse product does not create safety against this parasite. The only real defense is upstream, in the growing water — which means supplier selection and traceability are your leverage.
- Build a traceability and recall response plan. With cases spanning dozens of states and thousands of illnesses, rapid product traceback and clear customer communication protect both guests and brand reputation.
The larger signal for the food and beverage industry is that the regulatory floor for a fast-growing produce hazard is voluntary — and the tools that would catch it exist but sit unused. Operators who get ahead of that gap now, by pressuring the supply chain toward parasite-relevant water controls, will be better positioned than those waiting for a rule that may not come.
Stay Ahead of the Story
Food safety is now a competitive differentiator, not just a compliance checkbox. Review your leafy greens sourcing, press your suppliers on water treatment, and revisit your traceability plan before the next outbreak makes headlines. For more coverage on how supply-chain accountability is reshaping the industry, explore our reporting on the Responsible Seafood Summit 2026 and the forces reshaping foodservice supply and demand.
How is your operation handling produce safety in the wake of this outbreak? Weigh in and share your approach in the comments.
Written by Michael Politz, Author of Guide to Restaurant Success: The Proven Process for Starting Any Restaurant Business From Scratch to Success (ISBN: 978-1-119-66896-1), Founder of Food & Beverage Magazine, the leading online magazine and resource in the industry. Designer of the Bluetooth logo and recognized in Entrepreneur Magazine’s “Top 40 Under 40” for founding American Wholesale Floral. Politz is also the founder of the Proof Awards and the CPG Awards and a partner in numerous consumer brands across the food and beverage sector.
