US lettuce-linked parasite outbreak sickens over 12,800 people

A foodborne illness outbreak linked to iceberg lettuce distributed in the United States has sickened 12,883 people, hospitalised 570 and caused two deaths, according to the US Food and Drug Administration (FDA).

The outbreak was linked to Cyclospora, a parasite that can cause intestinal illness. The FDA identified iceberg lettuce sourced from central Mexico by Taylor Farms de Mexico as the implicated product in the investigation, which has now been closed.

The agency said the company began voluntarily removing affected iceberg lettuce from the US market on July 17, 2026. The recall included certain Marketside-branded iceberg salad and shredded lettuce products sold at selected Walmart stores, as well as products distributed to food-service customers.

The affected retail products included 12-ounce and 24-ounce iceberg salads and eight-ounce and 16-ounce shredded lettuce packages bearing specified best-before dates between July 18 and August 3, 2026.

The FDA said those dates had passed and the recalled products should no longer be available in stores or restaurants. The agency’s investigation status is listed as ended, although it said it would provide updates on post-outbreak response activities.

The scale of the outbreak has raised concerns about the difficulty of tracing contamination through complex food supply chains and communicating recall information quickly to consumers.

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Cyclospora infection, known as cyclosporiasis, can cause frequent diarrhoea, loss of appetite, weight loss, abdominal cramps, bloating, nausea and fatigue. Some infected people may not experience symptoms, while others can develop prolonged illness.

The FDA warns that complications can include dehydration, and symptoms may appear to improve before returning. People with weakened immune systems may face more serious or longer-lasting illness.

The recalled lettuce was distributed to food-service customers across numerous US states, while selected Walmart stores also received affected Marketside products. The FDA noted that distribution may have extended beyond the locations it had confirmed.

The agency advised consumers who had purchased or received affected lettuce to ensure the products were not consumed and to clean and sanitise surfaces or containers that had come into contact with them.

The outbreak also highlights the challenges facing regulators when produce is distributed across multiple states and food-service businesses. Investigators were able to identify an implicated supplier, but the investigation’s closure did not mean that the outbreak had been small: the final reported figures showed thousands of illnesses and hundreds of hospitalisations.

The FDA said it would continue providing information about post-outbreak activities as it became available.

(FDA)