The CDC and FDA have traced a widespread cyclosporiasis outbreak directly to shredded iceberg lettuce supplied to Taco Bell. Federal investigators identified a California-based Taylor Farms facility operating in Mexico as the likely source of the contaminated produce.
The Centers for Disease Control and Prevention officially logged 1,645 laboratory-confirmed cases across 34 states. But state-level health departments reveal a much steeper toll. Michigan alone reported over 4,300 illnesses and 102 hospitalizations related to the outbreak.
Out of an abundance of caution, Taco Bell immediately pulled the potentially affected lettuce from its entire nationwide supply chain. The fast-food chain successfully replaced the ingredient at regional stores within 24 hours, according to a corporate statement.
The FDA traceback investigation isolated a single Taylor Farms supplier in Mexico that distributed the iceberg lettuce to Taco Bell locations across at least five highly impacted states. Those include Michigan, Ohio, West Virginia, Kentucky, and Indiana. This is not the first major food safety hurdle for the supplier. Last year, Taylor Farms was linked to an E. coli outbreak originating from a Colorado facility, which temporarily forced McDonald’s to pull onions from its Quarter Pounders, as federal investigators noted.
Tracing the Outbreak’s Impact
The fallout from the cyclospora contamination spread quickly beyond public health data, directly affecting financial markets and corporate logistics.
- Targeted Isolation: FDA investigators successfully traced the parasite back to a single Mexican growing operation supplying Taylor Farms, rather than a broad agricultural failure.
- Corporate Containment: Taco Bell executed a 24-hour nationwide swap of its iceberg lettuce supply to prevent further exposure.
- Market Shockwave: The fast-casual salad sector took a severe financial hit. Sweetgreen shares dropped roughly 25% this week before the company publicly confirmed its ingredients were completely unconnected to the cyclospora investigation.
How a 2025 Surveillance Rule Change Blinded Investigators
The difficulty in tracking this fast-moving outbreak is directly tied to recent regulatory shifts. In July 2025, the CDC updated its FoodNet surveillance network to make cyclospora tracking optional.
By requiring routine, mandatory reporting only for primary pathogens like salmonella and E. coli, public health officials lost critical visibility. Critics and lawmakers now argue this specific rule change severely limited the speed at which investigators could connect the dots during the early days of this crisis, leaving state health departments to manage the overflow of hospitalizations on their own.