Cyclospora Outbreak Linked to Iceberg Lettuce Expands to Four New States

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The Centers for Disease Control and Prevention (CDC) confirmed on July 24, 2026, that a Cyclospora outbreak linked to iceberg lettuce has expanded to four new states, marking a significant escalation in the public health investigation. The announcement follows reports of 214 laboratory-confirmed cases across 11 states, with 13 hospitalizations and no fatalities, according to the CDC’s latest update. The affected states now include Arizona, California, Colorado, and Texas, in addition to previously reported regions.

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The outbreak was first detected in late June 2026, with initial cases traced to commercially packaged iceberg lettuce distributed by a major supplier. The CDC’s investigation identified a common supplier, FreshLeaf Farms, as the likely source of contamination. “The traceback investigation is ongoing, but preliminary data suggest that the contaminated product was distributed to retail chains and food service providers across multiple states,” said a CDC spokesperson in a statement.

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Cyclospora cayetanensis is a parasitic organism that causes cyclosporiasis, a gastrointestinal illness characterized by watery diarrhea, loss of appetite, weight loss, and fatigue. Symptoms typically develop one to two weeks after ingestion and can persist for weeks if untreated. The CDC recommends that individuals experiencing symptoms seek medical care, as antibiotic treatment with trimethoprim-sulfamethoxazole is effective when administered promptly.

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The Food and Drug Administration (FDA) has issued a consumer advisory urging caution when handling prewashed or bagged lettuce. “Consumers should avoid eating any lettuce that may be contaminated and ensure thorough washing of all produce before consumption,” said an FDA spokesperson. The agency is collaborating with the CDC to trace the supply chain and identify additional points of contamination.

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Health officials emphasized that the outbreak underscores the challenges of food safety in a complex supply chain. “This incident highlights the need for rigorous testing and traceability in the produce industry,” said Dr. Sarah Lin, a public health microbiologist at the University of California, San Francisco. “Cyclospora is often difficult to detect in food samples, which can delay outbreak responses.”

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The CDC has also issued guidance for healthcare providers to increase testing for Cyclospora in patients presenting with persistent diarrhea. “Providers should consider cyclosporiasis in patients with a history of consuming fresh produce, especially during peak seasons for outbreaks,” the CDC stated.

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As of July 24, 2026, no recalls have been issued for specific products, but the CDC is working with retailers to remove potentially contaminated lettuce from shelves. Consumers are advised to check for product recalls on the FDA’s website and to contact local health departments for updates.

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The outbreak has raised concerns about the safety of prewashed greens, which are marketed as convenient but may carry risks if not properly handled. A 2023 study published in the Journal of Food Protection found that 12% of prewashed lettuce samples tested positive for pathogens, though Cyclospora was not among them. Public health experts are calling for stricter regulations on produce washing protocols.

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“We are closely monitoring the situation and will provide updates as new information becomes available,” said a CDC representative. The agency also urged individuals to report illnesses through their local health departments to aid in outbreak tracking.

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The current outbreak is the largest Cyclospora outbreak in the U.S. since 2018, when a similar incident linked to prewashed kale affected 668 people across 25 states. Public health officials are using the lessons from that outbreak to accelerate response efforts this time, including enhanced data sharing between state and federal agencies.

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As the investigation continues, the CDC and FDA are urging consumers to remain vigilant. “This is a reminder that even seemingly safe foods can pose risks, and proactive measures are essential to prevent illness,” said Dr. Lin. Health officials emphasized that the risk to the general public remains low, but continued awareness and adherence to food safety practices are critical.