The Food and Drug Administration (FDA) clarified that a sample of Taylor Farms lettuce that previously tested positive for Cyclospora was a false positive. Investigations, however, still point to shredded iceberg lettuce from central Mexico as the likely source of the ongoing outbreak.
Ongoing Investigation and Recall
As of Sunday, the FDA had found no confirmed positive sample results for Cyclospora. Despite the false positive, officials emphasized that the traceback and epidemiological data continue to support Taylor Farms’ voluntary recall of iceberg lettuce sourced from central Mexico.
Taylor Farms announced that it is removing all iceberg lettuce from the region indefinitely, even though the implicated farm represents less than 1% of U.S. iceberg lettuce supply.
Complexity of Cyclospora Testing
Testing for Cyclospora is more challenging than for other pathogens like E. coli or Salmonella. Jennifer McEntire, a food safety consultant, noted the complexity of detecting this parasite, while CBS News medical correspondent Dr. Céline Gounder described the false positive as an ordinary laboratory event. She questioned the FDA’s policy for announcing presumptive positives before confirmatory testing is complete.
Impact on Restaurants and Retail
The CDC identified lettuce supplied to select Taco Bell restaurants in Indiana, Kentucky, Michigan, Ohio, and West Virginia as linked to the outbreak. Taco Bell has removed all affected Taylor Farms lettuce. Walmart also recalled four bagged iceberg salad products across more than two dozen states, although no contamination was confirmed in its stores.
Outbreak Overview
The outbreak, first reported in May, has affected 34 states and sickened over 1,600 people, according to the CDC. State health departments report higher counts; Michigan alone has confirmed more than 5,000 cases. No deaths have been reported.
Cyclosporiasis is caused by the Cyclospora parasite and leads to long-lasting watery diarrhea. Historically, outbreaks have been linked to bagged salads, cilantro, basil, raspberries, snow peas, and green onions.
Company Statement
Taylor Farms said it remains committed to public health authorities and continues to monitor the outbreak closely, expressing concern for those affected and pledging cooperation throughout the ongoing investigation.
