FDA Confirms Taylor Farms Lettuce Sample Was a False Positive in Cyclosporiasis Investigation

Topline

The Food and Drug Administration has confirmed that a lettuce sample from Taylor Farms, which was previously identified as a positive source for the ongoing cyclosporiasis outbreak, was a false positive. This revelation means the major produce supplier can no longer be definitively linked to the current wave of illnesses caused by the parasite.

Key Facts

On Sunday, the FDA announced that a re-examination of the Taylor Farms lettuce sample yielded a false-positive result for cyclospora, removing the primary laboratory link between the brand and the outbreak.

While investigators have not fully cleared Taylor Farms, they noted that all other produce tested from the company has returned negative results. The company continues to cooperate with federal authorities to ensure any potentially implicated products are removed from circulation.

Despite the lack of laboratory confirmation, investigators still suspect that shredded iceberg lettuce supplied to Taco Bell may be the source due to common exposure among patients. However, a definitive link has yet to be established.

Taylor Farms maintains its recent recall of iceberg lettuce sourced from central Mexico, which covers 27 states, and continues to work with health officials to pinpoint the exact source of the contamination.

Key Background

Over the last two months, more than 7,000 confirmed or suspected cases of cyclosporiasis have been reported across at least 34 states, with Michigan emerging as a primary epicenter. This intestinal disease, caused by the cyclospora parasite, can cause severe diarrhea and has resulted in over 140 hospitalizations. While the link to Taco Bell was suspected last week due to patient reports, the FDA has been unable to confirm the connection through testing. The CDC warns that case numbers may rise through late August and advises physicians to test patients exhibiting symptoms for the parasite.

What is Cyclosporiasis?

Cyclosporiasis is an intestinal infection caused by the parasite *Cyclospora cayetanensis*. According to the CDC, the parasite is typically contracted through contaminated food or water rather than person-to-person transmission. While often debilitating, the illness is generally not life-threatening.

Challenges in Investigating Cyclospora

Tracing cyclosporia outbreaks is notoriously difficult, often compared to finding a “needle in a haystack.” The parasite is hard to detect on fresh produce, and contaminated items are often consumed and cleared from the supply chain before testing begins. Contamination typically occurs via irrigation water during the growing process rather than during processing, forcing investigators to rely on epidemiological data and traceback patterns rather than direct lab confirmation.

Preventative Measures

Experts recommend consuming produce that can be peeled and exercising caution with raw vegetables that are difficult to wash thoroughly. While washing may reduce the spread, it may not entirely eliminate the parasite. To ensure safety, cooking contaminated food to 158°F (70°C) will kill the parasite. Frozen and canned fruits and vegetables are considered safe.

Taylor Farms Distribution Areas

The recalled shredded iceberg lettuce was distributed between June 29 and July 16 to various locations, including Alabama, Arkansas, Connecticut, Florida, Georgia, Iowa, Illinois, Indiana, Kansas, Kentucky, Louisiana, Massachusetts, Maryland, Michigan, Missouri, Mississippi, North Carolina, New Hampshire, New Jersey, Ohio, Oklahoma, Pennsylvania, South Carolina, Tennessee, Texas, Virginia, and Wisconsin. All other Taylor Farms products, such as salad kits, remain unaffected.

Political Context

Taylor Fresh Foods Inc., the parent company of Taylor Farms, has been noted for significant political contributions. Notably, the company made a $1 million donation to the MAGA Inc. super PAC in March 2025. This occurred shortly before the FDA announced a delay in implementing the “Food Traceability Rule,” a major reform intended to mandate standardized digital records for high-risk foods—including leafy greens and tomatoes—to allow for faster traceback during outbreaks. The rule is currently scheduled to take effect in July 2028.

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