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The FDA has wrapped up its investigation into a major cyclospora outbreak tied to shredded iceberg lettuce from Taylor Farms de Mexico, finding a strong epidemiological link but no definitive answer on how contamination occurred. Mexico's food-safety regulator pushed back, noting its own lab tests came back negative. The CDC had already declared the outbreak over on September 11, after nearly 20,000 confirmed cases and two deaths.
The FDA has officially closed its investigation into a widespread cyclospora parasite outbreak linked to recalled shredded iceberg lettuce produced by Taylor Farms de Mexico. While investigators established a strong epidemiological and supply-chain traceback connection to the Mexico facility, they could not definitively determine how the contamination occurred. Two environmental samples tested positive for cyclospora — one from wastewater leaving Taylor Farms' processing facility and another from a drainage ditch at a nearby iceberg lettuce farm — but genetic analysis comparing those samples to patient isolates is still ongoing.
Mexico's food-safety regulator, Cofepris, pushed back on the findings, stating that its own national reference laboratory tests on raw materials, finished products, and water from the facility all came back negative for cyclospora. Mexican officials emphasized that environmental findings alone don't constitute conclusive proof that agricultural products were the contamination source.
Looking ahead, the FDA announced a 10-point prevention plan ahead of the 2027 growing season, including enhanced monitoring of produce historically linked to the parasite and increased outreach to growers.
By the Numbers:
Why it matters: This outbreak was one of the largest cyclospora events on record in the US, exposing significant gaps in cross-border food safety oversight. The unresolved question of how contamination occurred — and the conflicting findings between US and Mexican regulators — underscores the complexity of investigating foodborne illness in global supply chains.
