Washington, DC – September 11, 2026
U.S. health officials announced Friday that the largest recorded cyclosporiasis outbreak in American history has ended, declaring the contaminated product that sickened nearly 13,000 people across 21 states no longer poses a public health risk.
The Centers for Disease Control and Prevention confirmed that all Taylor Farms de Mexico iceberg lettuce tied to the outbreak has passed its best-by dates and been removed from store shelves and restaurant menus. Federal investigators traced the Cyclospora parasite contamination to lettuce processed in central Mexico and distributed across the United States since May 2026.
Outbreak Origins and Investigation
CDC and FDA investigators began tracing the outbreak in July 2026 after hospitals in Michigan, Ohio, and Kentucky reported spikes in cyclosporiasis cases. The illness typically begins about one week after consuming contaminated food, with symptoms including watery diarrhea, fatigue, loss of appetite, and cramping that can persist for weeks without treatment.
By late July, epidemiological and traceback data confirmed iceberg lettuce from Taylor Farms de Mexico as the source. The company voluntarily recalled all iceberg lettuce sourced from central Mexico on July 17, 2026, including Marketside-brand products sold at Walmart locations nationwide.
"The contaminated lettuce linked to this outbreak is no longer available in stores or restaurants," the CDC said in Friday's update. "At this time, there is no risk of people getting sick with cyclosporiasis from this source."
Human Impact and Geographic Spread
Michigan recorded more than 14,000 total cyclosporiasis cases with two deaths linked to the parasite, according to state and federal health officials. Ohio and Missouri each reported thousands of infections tied to the contaminated lettuce. The outbreak spread across 49 states and Washington, DC, though only 21 states had cases confirmed as part of the Taylor Farms outbreak.
The median age of infected individuals was 46, with women accounting for 56% of cases. Cyclosporiasis is nationally notifiable and reportable in 47 states, the District of Columbia, and New York City.
Public Health Response and Food Safety
The Food and Drug Administration conducted onsite inspections and sampling at lettuce growers and processing facilities in Mexico throughout August and early September. The FDA concluded Friday that it has sufficient evidence confirming all recalled lettuce related to this outbreak has been removed from U.S. markets.
FDA officials reminded regulated industry that they must continue applying science-based agricultural water management practices, worker health and hygiene controls, and equipment sanitation standards. The agency stated that strong supplier verification remains critical to ensuring produce entering U.S. commerce meets federal food safety standards.
CDC recommends that consumers wash hands and fresh produce thoroughly under running water before eating, cutting, or cooking. The agency noted that cooking produce to an internal temperature of at least 158°F (70°C) can kill the parasite, as washing alone cannot guarantee removal.
Implications for Produce Safety Standards
Food safety experts note that the cyclospora outbreak highlights ongoing challenges in tracing produce contamination across complex international supply chains. Cyclospora is a microscopic parasite typically transmitted through fecal contamination of crops during irrigation or handling.
Researchers studying the outbreak have emphasized that cyclospora cases remain underreported in many regions. Stool tests do not routinely screen for the parasite unless specifically requested, and symptoms can be mild in healthy adults, leading to unreported cases.
Ongoing Surveillance and Future Monitoring
Even with the outbreak officially declared over, FDA and CDC officials will continue monitoring cyclosporiasis cases nationwide. The agencies plan to reduce update frequency on this specific outbreak investigation as new case reports decline.
CDC surveillance data shows cyclosporiasis cases began declining in August after peaking in early July, when more than 400 new infections were reported weekly. The decline coincided with removal of recalled lettuce from markets and public warnings to avoid consumption.
Federal health officials noted that similar outbreaks linked to fresh produce occur several times each year, including incidents involving leafy greens, berries, and melons. The cyclospora outbreak remains the largest foodborne illness incident in 2026.
Source: CDC, September 11, 2026. FDA, September 11, 2026. Reuters, September 11, 2026. KCTV5, September 11, 2026.
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Institutional Research Desk · Foresight Institute of Research and Translation
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