The agency said a previous finding was “a false positive,” but the supplier to companies such as Walmart and Taco Bell remains at the heart of an ongoing investigation.

Taylor Farms de Mexico lettuce sample tested positive for cyclospora, FDA said, as officials investigate a multistate outbreak of the parasite.

Taylor Farms has confirmed that this product is not part of its current recall, the FDA said, as it seeks to curtail the largest foodborne illness outbreak in the United States in…

‘Today, FDA apologized to us,’ Taylor Farms said in a statement

The FDA announced a positive cyclospora result for Taylor Farms’ iceberg lettuce on Saturday, but later declared it a false positive.