FDA investigators closed their work last week on the largest cyclospora outbreak ever recorded in the United States, tracing more than 12,000 illnesses to a Taylor Farms supplier in Guanajuato, Mexico.

The Food and Drug Administration identified two contamination zones — a wastewater tank and a drainage ditch used for lettuce cultivation — but did not explain how the parasite reached the lettuce at the Taylor Farms facility.

Taylor Farms, a major fresh-cut produce supplier serving foodservice distributors, quick-service restaurant operators and retail deli counters across North America, said the Mexican operation is no longer in its supplier network. The company added that its central Mexico facility remains closed while a research team executes enhanced safety protocols for the field and facility.

How does this compare to prior outbreaks?

The 12,000-plus case count exceeds any prior cyclospora cluster tied to U.S. fresh-produce distribution. Cyclospora cayetanensis triggers prolonged diarrheal illness, and in this outbreak illnesses tracked to iceberg lettuce consumed during a defined window earlier in the year.

What did inspectors find?

FDA inspectors spent more than six weeks on the farm in Guanajuato, sampling across cultivation zones, water-handling infrastructure and processing access points. The agency returned positive cyclospora results from:

• A wastewater tank on the property
• A drainage ditch used for irrigation and cultivation

The findings identify where the contamination lived but not how it arrived — leaving water source, worker handling, wildlife intrusion or cross-contamination as vectors still on the table.

When was the farm last inspected?

The Guanajuato visit marked the FDA's first on-site inspection at the facility in more than seven years. Pandemic-era travel restrictions and resource reallocation interrupted routine produce-safety inspections across Mexico, leaving coverage gaps this outbreak has now surfaced.

What did Mexican regulators conclude?

Mexico's food-safety agency reported it found no evidence of cyclospora at the farm. The declaration came in August, a few days after the FDA retracted an earlier claim that it had misidentified cyclospora in a lettuce sample drawn from a Taylor Farms shipment at the U.S.-Mexico border. The contradictory conclusions raise questions about sample handling, testing thresholds and which agency's protocol prevails in cross-border contamination disputes.

What changes for distributors?

For broadline foodservice operators, retail produce buyers and processors sourcing Taylor Farms products, the FDA's source identification narrows recall scope but not liability exposure. Distributors that carried Taylor Farms lines during the exposure window remain in plaintiffs' crosshairs, and the unresolved contamination mechanism keeps insurance underwriters cautious on Mexican leafy-greens imports.

Taylor Farms' facility closure also pulls a meaningful slice of imported iceberg lettuce out of the U.S. supply just as domestic production transitions to Arizona and California desert-growing regions. Contract pricing on processed lettuce packs has not been disclosed, but tighter allocations are likely pending the Mexico facility's reopening timeline and any successor grower Taylor Farms brings online.