The FDA reported a false positive in testing shredded iceberg lettuce from Taylor Farms' Mexican operations for Cyclospora, the parasite behind a massive multistate outbreak. The false positive raises questions about testing methodology and how conclusively investigators can link the pathogen to a specific source or growing operation.
This is a significant wrinkle in an already complex investigation. The industry has been watching closely since Taylor Farms pulled all Central Mexico iceberg from the supply chain, and the false positive adds uncertainty to whether that sourcing decision resolved the core risk. The Cyclospora story has been the defining food safety event of the summer, touching leafy greens supply chains, buyer protocols, and public trust.
Watch for follow-up testing results and whether FDA adjusts its investigative focus to other suppliers or regions. Buyers still managing contingency sourcing for iceberg should treat this as an unresolved situation, not a clearance.