Mexico Denies Link to US Lettuce Outbreak as FDA Investigation Continues

Mexican officials on Tuesday said there is no evidence to suggest that lettuce from Mexico is the cause of a cyclosporiasis outbreak in the United States, directly challenging the findings of a U.S. Food and Drug Administration (FDA) investigation.

Mexico Contests US Findings

Mexico’s Health Minister, David Kershenobich, stated that authorities are investigating the matter in the central state of Guanajuato but have not confirmed a link. "So far, no evidence has been found to indicate that it originated there," Kershenobich said at a government press conference. He added, "However, we are taking all precautions in case that were the case."

In a joint statement, Mexico’s sanitary regulator, Cofepris, and its agricultural safety body, Senasica, confirmed that an interagency group is conducting "strictly preventive" inspections and traceability analyses to mitigate any potential health risks.

FDA Investigation Points to Supplier

The FDA reported on Monday that its traceback investigation into the outbreak continues to point to shredded iceberg lettuce from Taylor Farms facilities in central Mexico. The U.S. Centers for Disease Control and Prevention (CDC) has linked the parasitic infection, which causes severe gastrointestinal symptoms, to lettuce served at Taco Bell restaurants across five states, resulting in approximately 100 hospitalizations.

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The investigation has been marked by uncertainty. The FDA initially announced on Saturday that a sample of Mexican lettuce from Taylor Farms tested positive for the parasite, but retracted the finding on Sunday, calling it a false positive after a data re-review.

Context and Background

This is not the first time the supplier's facilities have been under scrutiny. According to the CDC, Taylor Farms de Mexico was identified as the source of a major U.S. cyclosporiasis outbreak in 2013. That incident sickened more than 600 people in 25 states and was traced to a salad mix produced in Guanajuato.

The current outbreak has implications for the cross-border food supply chain and for Yum! Brands, the parent company of Taco Bell. Investors will be watching for any official confirmation of the source, which could lead to import restrictions and reputational damage.