The FDA confirmed a false positive test for Cyclospora in Taylor Farms lettuce but reiterated its link to the multistate outbreak, which has sickened over 1,600 people. Companies like Taco Bell and Walmart have removed affected products, while investigators continue tracing the contamination source.
The Food and Drug Administration (FDA) retracted a false positive test result for Cyclospora in Taylor Farms lettuce, but maintained its conclusion that the outbreak is tied to shredded iceberg lettuce from central Mexico. The agency emphasized that the false positive does not change the basis for FDA's ongoing outbreak investigation
or the voluntary recall by Taylor Farms, which has removed all iceberg lettuce from the region indefinitely.
False Positive Sparks Confusion, but FDA Stands by Core Findings
A sample of Taylor Farms lettuce tested positive for Cyclospora, but the FDA later classified it as a false positive,
stating that no confirmed positive sample results for product testing for Cyclospora
had been found. The agency clarified that the error does not change the basis for FDA's ongoing outbreak investigation
or the overwhelming epidemiological data supporting the current voluntary recall by Taylor Farms.
CBS News reported that the false positive was ordinary as a laboratory event,
but the timing—publicly announced on a Saturday and retracted on a Sunday—raised questions. Dr. Céline Gounder, CBS News medical correspondent, said: The unusual thing isn’t the false positive. It’s that an unconfirmed single-sample result went public on a Saturday and was withdrawn on a Sunday.
FDA’s Investigation Points to Central Mexico Source
The Centers for Disease Control and Prevention (CDC) identified lettuce supplied to select Taco Bell restaurants as a source of the outbreak on Thursday. The affected lettuce was distributed to restaurants in Indiana, Kentucky, Michigan, Ohio, and West Virginia. Taco Bell confirmed it had completed removal of affected Taylor Farms lettuce from our restaurants.
For more on this story, see Taylor Farms Linked to Cyclosporiasis Outbreak Despite Retracted Lab Result.
Retailers Take Precautionary Measures
Walmart proactively removed four Marketside bagged iceberg lettuce salad products from stores in more than two dozen states, even though it stated there was no indication that products sold in our stores are affected by the current Cyclospora investigations.
The company added, There have been no confirmed illnesses associated with these products at this time.
Taylor Farms reiterated its commitment to working with public health authorities, stating, Our thoughts remain with everyone who has fallen ill in this outbreak. We are committed to working with public health authorities as the ongoing outbreak investigation continues.
The company’s voluntary recall includes iceberg lettuce sourced from central Mexico, which has been linked to over 1,600 cases across 34 states, according to the CDC.
This follows our earlier report, Taco Bell Lettuce Linked to Multistate Cyclospora Outbreak as Cases Surge.
Public Health Implications and Consumer Concerns
Cyclosporiasis, caused by the Cyclospora parasite, leads to prolonged watery diarrhea and can last weeks. Outbreaks typically occur in late spring and summer, with historical links to bagged salads, cilantro, basil, raspberries, snow peas and green onions. The Michigan Department of Health and Human Services reported more than 5,000 confirmed cases as of Friday, far exceeding the CDC’s tally.
The FDA’s handling of the false positive has drawn scrutiny. Frank Yiannas, former deputy commissioner of food policy and response at the FDA, noted that the development may add further confusion to what has already been a complex situation for consumers.
Despite the uncertainty, the agency continues to advise Americans not to eat recalled iceberg lettuce.
What Comes Next for the Outbreak and Affected Companies
The FDA has not yet responded to questions about the next phase of its investigation, including whether additional ingredients or suppliers are under scrutiny. Meanwhile, the outbreak’s impact on businesses like Taco Bell and Walmart remains uncertain. Foot traffic at Taco Bell dropped 19% on Friday compared to the day-of-the-week average so far this year, according to Placer.ai data, though analysts expect the effects to be temporary.
Read also: Taylor Farms Linked to Cyclosporiasis Outbreak.
Taylor Farms and its suppliers face ongoing pressure to address the contamination. The company’s statement emphasized its commitment to working with public health authorities,
but the full scope of the outbreak’s economic and reputational consequences remains unclear. As the FDA continues its investigation, consumers are advised to follow health warnings and monitor updates from trusted sources.
