July 20, 2026, 12:30 AM EDT / Updated July 20, 2026, 2:41 PM EDT
The false positive was discovered when the FDA again reviewed the results of a sample from Taylor Farms de Mexico that was reported positive Saturday
“As of July 19, 2026, there are no confirmed positive sample results for product testing for Cyclospora,” the agency said in its statement
The false positive does not change the company’s earlier voluntary recall of its iceberg lettuce that was
Taylor Farms, which produces lettuce for Taco Bell and multiple grocery retailers, continues “working with the firm to ensure product implicated in this outbreak has been removed from the market,” the FDA said in a statement Sunday evening
In a statement Sunday night, Taylor Farms saidthe FDA made a mistake and apologized. It echoed the agency’s statement and said the FDA has not identified a “single positive product test result for Cyclospora.”
A U.S. Department of Health and Human Services spokesperson on Monday said that the FDA did not apologize, but “simply sent Taylor Farms the facts and what was found following the study.”
Taylor Farms said it will continue to work with public health officials investigating the origins of the outbreak
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In the FDA’s Saturday notice of the positive test, which it has since removed from its updates on the outbreak, it said that product was not part of the existing Taylor Farms recall and that the company was “working to identify whether any part of this implicated lot is available in commerce or in consumers homes.”
The company announced Friday that Taylor Farms de Mexico was voluntarily recalling iceberg lettuce he potential to be contaminated with Cyclospora.” The recalled products had been distributed to stores in 27 states, according to the FDA
The recall came after the FDA zeroed in on the product, which it said had been provided to Taco Bell locations in five states where people ate before being sickened
The same day, Taco Bell said it would no longer use the producer for its lettuce
Nearly 7,000 casesof cyclosporiasis have been confirmed or are under investigation in the United States since May 1, according to the Centers for Disease Control and Prevention. The foodborne illness can cause severe watery diarrhea, fatigue or loss of appetite, experts say
The FDA said Saturday’s positive test was an erroneous result based on false amplification. “The finding does not represent true amplification and should be considered a false positive,” it said
Amplification creates copies of samples used to investigate pathogens, which can be easier to identify when amplified. According to research in the Annals of Clinical & Laboratory Science, “Amplification-based techniques are now used routinely in clinical laboratories to detect organisms that do not grow in conventional culture media.”
Thomas Gremillion, director of food policy at the Consumer Federation of America, said last week that it is “really hard to grow cyclospora in the lab.”
Donald W. Schaffner, chair of the department of food science at Rutgers University, said Sunday that the Taylor Farms recall was “the right thing” for it to do, regardless of the status of lab tests, and said the FDA showed courage in admitting it was wrong about the positive test
“Unfortunately testing for this organism is difficult,” he said by email. “False positives are always possible. In this case, I think it may lead to more confusion and uncertainty in the minds of consumers.”
He said regulatory agencies should have to provide more data when announcing positive results, including the false positive rate
“I would hope that consumers wouldn’t ignore it,” he said, referring to the false positive, “but realize that the science is complicated.”
