CDC declares largest US cyclospora outbreak over after 12,883 infections and two deaths

The US Centers for Disease Control and Prevention declared on Friday, September 11, 2026, that the largest recorded multistate cyclospora outbreak in the nation's history is over. The outbreak, linked to processed iceberg lettuce from Taylor Farms de Mexico, sickened 12,883 people across 21 states, led to 570 hospitalizations and caused two deaths. The CDC said cases had significantly declined, and that the best by dates for all product linked to the outbreak had passed, meaning it was no longer available in stores or restaurants.

Cyclospora is a microscopic parasite that causes an intestinal illness called cyclosporiasis. It is spread through contaminated food or water. Common symptoms, which typically begin about one week after infection, include watery and sometimes explosive bouts of diarrhea, loss of appetite and weight, stomach cramps and bloating. The CDC says deaths from cyclosporiasis are uncommon because it is not usually life threatening. The two deaths, both in Michigan, were of people who had significant underlying health conditions that may have been impacted by cyclosporiasis and dehydration, according to Michigan health officials.

The national picture was far wider than the lettuce linked cluster. Between May 1 and September 8, 2026, the CDC reported a total of 19,595 laboratory confirmed cases of cyclosporiasis across the United States, including the 12,883 infections tied to the contaminated lettuce. Cases were reported across 49 states and Washington DC. The median age of those infected was 46, with women accounting for 56% of cases and men accounting for 44%. Before this outbreak, the worst year for infections was 2019, when there were about 4,700 cases across the country.

The outbreak grew rapidly. Before the recall of the relevant packaged lettuces, there were more than 1,000 infections that occurred in a single day at the peak of the outbreak. By August, there were fewer than two infections a day on average. Food Safety News reported on September 11 that the outbreak had sickened 12,883 patients from 21 states and resulted in 570 hospitalizations and two deaths, and that since the last update, one additional state had been added: Virginia.

Key Facts

The CDC declared the outbreak over on Friday, September 11, 2026. The agency said in an advisory notice that cases had significantly declined and that it was continuing to investigate the cause of the infection. The Food and Drug Administration, however, said on the same day that its investigation associated with Taylor Farms de Mexico continues, as well as investigations into other cyclospora clusters from the summer.

Iceberg lettuce from a Taylor Farms growing and production operation in central Mexico was named by the FDA as the likely vehicle for the parasite. The FDA announced its investigation into the outbreak on July 16. On July 17, traceback converged on a single supplier, Taylor Farms de Mexico, which initiated a voluntary recall the same day. The recall affected iceberg lettuce products purchased and distributed by Sysco, the largest foodservice provider in the country, and iceberg lettuce products sold at Walmart stores under the Marketside brand were also included in the recall. Most illnesses tied to the outbreak began before the July 17 recall.

Investigators said data pointed them toward shredded iceberg lettuce associated with illnesses in people who reported eating at some Taco Bell locations. The FDA traced the lettuce to Taylor Farms and growers based in Mexico. In mid July, Taylor Farms de Mexico announced it had removed all iceberg lettuce sourced from central Mexico from the US market, and Taylor Farms began a recall. Taco Bell said it removed lettuce from the supplier from its menu.

The FDA's onsite inspections and sample collection at growers and the processing facility in Mexico, in coordination with Mexican officials, have ended, and samples are pending analysis. The Taylor Farms facility in Doctor Mora, Mexico, remains closed with no reopening date. During the week of September 8, senior FDA and Mexican public health and agricultural officials met on a prevention focused framework. In a letter sent to supply chain industry leaders on Friday, the FDA said more work must be done on prevention, agricultural water management, worker hygiene and supplier verification.

CNN reported on September 11 that the CDC had declared the summer's outbreak of cyclosporiasis tied to iceberg lettuce ended as of Friday, and that the FDA will continue its investigation of cyclospora infections linked to iceberg lettuce sourced from central Mexico and recalled by Taylor Farms de Mexico. The FDA said it remains confident that all recalled iceberg lettuce related to this specific Cyclospora outbreak is off the market.

Analysis

The numbers tell a story of a food safety failure that unfolded at extraordinary scale. The outbreak sickened 12,883 people across 21 states, hospitalized 570 and killed two, making it the largest recorded multistate cyclospora outbreak in US history. The broader national total of 19,595 laboratory confirmed cyclosporiasis cases from May 1 to September 8, across 49 states and Washington DC, shows that the lettuce linked cluster was the dominant but not the only source of illness this summer. The CDC notes the true number of people sick is likely much higher, because many cases are never laboratory confirmed.

What this really means is that the declaration that the outbreak is over does not close the book on the underlying problems. The FDA's investigation continues, and the agency has already signaled that more work is needed on agricultural water management, worker hygiene and supplier verification. The Doctor Mora processing facility remains closed, and the FDA's samples from its inspections in Mexico are still pending analysis. The recall removed the product from the market, but the conditions that allowed the contamination have not been fully explained.

The Guardian reported on September 11 that the US's largest recorded multistate outbreak of sickness caused by the cyclospora parasite had ended, linked to processed iceberg lettuce from Taylor Farms in central Mexico. The reporting noted that the CDC said there was no risk of people getting sick with cyclosporiasis from this source because best by dates had passed and the product was no longer available. That is a product level assurance, not a system level one. The distinction matters for how regulators and the food industry think about prevention.

BBC News reported on September 12 that the largest outbreak of an intestinal infection that spread across several US states and affected more than 12,000 people had ended. The report described cyclospora as a microscopic parasite that can cause explosive diarrhoea, and noted that two people died and 570 were hospitalized. It also said the CDC was continuing to investigate the cause of the infection. That language is telling: even as the acute event is declared over, the causal investigation is not.

Why It Matters

This outbreak matters because of its scale and its source. At 12,883 infections, it dwarfs the previous worst year for cyclosporiasis, 2019, when there were about 4,700 cases across the country. The speed of the spread, with more than 1,000 infections in a single day at the peak, shows how quickly a contaminated ingredient distributed through major foodservice and retail channels can sicken people in many states. The involvement of Sysco and Walmart shows how widely the product traveled.

It also matters because cyclospora is difficult to manage. Food contaminated with cyclospora does not look, smell or taste bad. Washing does not remove the parasite, and chlorine does not kill it. That makes traditional produce safety measures insufficient. The FDA's emphasis on prevention, agricultural water management, worker hygiene and supplier verification reflects the need for controls earlier in the supply chain, at the growing and processing stages.

The human cost is clear: two deaths, both in Michigan, among people with significant underlying health conditions that may have been impacted by cyclosporiasis and dehydration. The median age of those infected was 46, and women accounted for 56% of cases. The outbreak hospitalized 570 people. Those numbers represent real harm, and they explain why federal and state officials treated the event as a major public health moment.

Next Up

The FDA's investigation into Taylor Farms de Mexico continues, along with investigations into smaller cyclospora clusters from the summer. Samples from the agency's onsite inspections in Mexico are pending analysis, and the Doctor Mora facility remains closed with no reopening date. The FDA is continuing its investigation while transitioning to prevention oriented activities after the response phase.

The CDC, meanwhile, says it is continuing to investigate the cause of the infection. The agency has not ruled out other sources or routes. For consumers, the immediate risk from this specific source has passed, but the broader questions about how the contamination happened and how to prevent a repeat are still open.