Summary (tl;dr)

The Food and Drug Administration (FDA) has retracted an earlier positive test result for cyclospora in a Taylor Farms lettuce sample, deeming it a "false positive." Despite this, the FDA's broader investigation still links shredded iceberg lettuce from Taylor Farms de Mexico to a multistate cyclospora outbreak, prompting a continued voluntary recall of the product by Taylor Farms and removal from retailers like Walmart and restaurants such as Taco Bell.

Essential Background

A widespread cyclospora outbreak has affected thousands of individuals across multiple U.S. states. Federal health agencies, including the FDA and the Centers for Disease Control and Prevention (CDC), identified shredded iceberg lettuce as a likely source, with traceback investigations initially pointing to Taylor Farms de Mexico, particularly lettuce served at Taco Bell locations in several states. This led to a voluntary recall by Taylor Farms of all iceberg lettuce sourced from central Mexico, impacting both foodservice customers and retail products, including Walmart's Marketside brand.

The Full Story

On July 19, 2026, the FDA announced it was retracting a previously reported positive test for the cyclospora parasite in a sample of Taylor Farms lettuce, clarifying that further expert review determined the finding to be a "false positive". The agency reportedly apologized to Taylor Farms for the error. However, the FDA emphasized that its epidemiological data and traceback investigation continue to converge on shredded iceberg lettuce from Taylor Farms locations in central Mexico as the vehicle for the ongoing multistate cyclosporiasis outbreak. In response to the initial findings, Taylor Farms had already initiated a voluntary recall of iceberg lettuce sourced from central Mexico as a precautionary measure, which remains in effect. Consequently, Walmart proactively removed Marketside-brand iceberg lettuce products supplied by Taylor Farms from its shelves in 15 states, and Taco Bell similarly ceased using implicated lettuce from the supplier in its restaurants across affected states.

Why It Matters

This development highlights the complexities inherent in foodborne illness investigations and the challenges of communicating evolving information to the public. The retraction of a positive test result, while potentially offering some relief, can also create confusion and impact consumer confidence in food safety alerts. With thousands already sickened by cyclospora, public interest remains high regarding the safety of fresh produce. The continued recall, despite the "false positive" lab result, underscores the seriousness of the widespread outbreak and the ongoing efforts by food suppliers and retailers to prioritize public health and remove potentially contaminated products from the market.

Geographic Location

• Central Mexico, Mexico (origin of implicated iceberg lettuce and processing for Taylor Farms de Mexico)
• Salinas, California, United States (headquarters of Taylor Farms, the company coordinating the recall)
• Mahoning County, Ohio, United States (location of first cyclospora lawsuit filing against Taco Bell and Taylor Farms)
• Multiple U.S. States, United States (states where recalled Taylor Farms iceberg lettuce products were distributed from June 29 through July 16, including Alabama, Arkansas, Connecticut, Florida, Georgia, Iowa, Illinois, Indiana, Kansas, Kentucky, Louisiana, Massachusetts, Maryland, Michigan, Mississippi, Missouri, North Carolina, New Hampshire, New Jersey, Ohio, Oklahoma, Pennsylvania, South Carolina, Tennessee, Texas, Virginia, and Wisconsin)