After Record Cyclosporiasis Season, Taylor Farms Suspends Central Mexico Iceberg Lettuce Indefinitely

Taylor Farms, one of North America’s largest produce suppliers, announced on October 8, 2026, that it will indefinitely suspend the harvesting and processing of iceberg lettuce from its central Mexico operations for sale in the United States or Canada during the Centers for Disease Control and Prevention’s (CDC) defined U.S. cyclospora season. The decision follows a multistate outbreak of cyclosporiasis linked to shredded iceberg lettuce from the company’s Mexican subsidiary, an outbreak that federal officials declared over on September 11, 2026, and that ultimately accounted for more than 12,000 laboratory-confirmed illnesses.

In a letter addressed “to the families we feed,” Taylor Farms founder and CEO Bruce Taylor wrote that the company recalled all iceberg lettuce from the central Mexico facility in mid-July after the Food and Drug Administration identified it as a likely source of a portion of the summer’s cyclospora cases. Taylor said the company suspended production to permit an investigation by the FDA, Mexican health regulators, third-party experts, and its own internal team. The FDA subsequently reported that on-site inspections found two samples that tested positive for Cyclospora, one from a wastewater tank at a processing facility and one from a drainage ditch of a grower identified in the traceback investigation. The agency stated that while there was “not enough evidence to conclusively determine how contamination occurred,” the positive samples showed that the parasite was present in the environment where the lettuce was grown and processed.

The outbreak was the largest single cyclosporiasis event recorded in the United States. The CDC reported 19,883 laboratory-confirmed cyclospora cases nationwide between May 1 and September 15, 2026, compared with 1,180 cases during the same period in 2025. More than 12,000 of those cases were linked to the Taylor Farms de Mexico iceberg lettuce, with 570 hospitalizations and two deaths.

 Cyclospora Defined

Cyclospora cayetanensis is a single-celled parasite that infects the small intestine and causes an intestinal illness called cyclosporiasis. It is a coccidian parasite, meaning infected people shed oocysts, rather than cysts or eggs, in their feces. The parasite completes its life cycle in humans, but the oocysts passed in stool must mature, or sporulate, outside the host before they become infectious to another person. This process is thought to require at least one to two weeks under favorable environmental conditions. As a result, direct person-to-person transmission is considered unlikely.

Transmission occurs when people ingest food or water contaminated with sporulated oocysts. In the United States, foodborne outbreaks have been linked primarily to imported fresh produce, including raspberries, basil, cilantro, snow peas, sugar snap peas, and leafy greens. Cyclospora is unlikely to be killed by routine chemical disinfection or sanitizing methods, which complicates control efforts in commercial produce handling.

Signs and Symptoms

The incubation period for cyclosporiasis averages about one week, though it can range from two days to two weeks or more. The hallmark symptom is watery diarrhea with frequent, sometimes explosive, bowel movements. Other commonly reported symptoms include loss of appetite, weight loss, abdominal cramping or bloating, increased gas, nausea, and prolonged fatigue. Less common symptoms include vomiting, body aches, low-grade fever, and other flu-like symptoms.

If untreated, the illness may last from a few days to more than a month and can follow a remitting-relapsing course, in which symptoms appear to resolve and then return one or more times. The CDC advises that people with prolonged or remitting diarrhea, particularly during the summer months, should be evaluated for cyclospora, noting that testing for the parasite is not routinely performed in most U.S. laboratories and must be specifically requested.

Cyclosporiasis is treatable with a regimen of trimethoprim-sulfamethoxazole (TMP-SMX). The recommended course is typically seven to ten days, though immunocompromised patients may require longer treatment.

What Makes Cyclospora Dangerous

Although cyclosporiasis is not usually life-threatening, the infection carries several features that make it a significant public health concern.

Prolonged and relapsing illness. Without treatment, symptoms can persist for weeks or months and may recur after apparent resolution. This protracted course distinguishes cyclospora from many bacterial foodborne pathogens and increases the risk of dehydration, weight loss, and missed work or school.

Dehydration and severe complications. Untreated illness may lead to dehydration and severe complications requiring higher levels of care, with risks more pronounced among immunocompromised people, older adults, and children.

Extraintestinal sequelae. Published clinical reviews have associated Cyclospora cayetanensis infection with several post-infectious conditions, including reactive arthritis syndrome, Reiter syndrome, Guillain-Barré syndrome, and acalculous cholecystitis (inflammation of the gallbladder without gallstones). A 2018 clinical review described cyclosporiasis as a “protracted, relapsing gastrointestinal illness” and noted that biliary disease, Guillain-Barré syndrome, and reactive arthritis have all been reported following infection.

Diagnostic challenges. Because routine stool testing frequently does not include cyclospora, cases can go undetected or be misdiagnosed. Ova-and-parasite testing for Cyclospora requires special stains or other laboratory procedures not routinely conducted in most U.S. laboratories, and that not all gastrointestinal PCR panels include a cyclospora target. Underdiagnosis complicates both clinical management and outbreak detection.

Other Cyclospora Outbreaks Linked to Produce

The 2026 Taylor Farms outbreak is the largest on record, but it is not the first time the parasite has caused widespread illness through the food supply.

2018 and 2019 increases. National surveillance data show that reported U.S. cyclosporiasis cases rose sharply in the late 2010s. Annual cases tripled in 2018, reaching 3,519, and climbed to 4,703 in 2019, at the time the highest annual total reported. A 2019 outbreak linked to fresh basil from Mexico accounted for 241 confirmed cases across 11 states. The same year, a large multistate outbreak was linked to fresh cilantro, and a separate cluster of illnesses was associated with snow peas.

2023 season. As of October 24, 2023, 41 jurisdictions, including 40 states and New York City, had reported 2,272 laboratory-confirmed cyclospora cases. Investigations that year examined associations with fresh produce including cilantro, raspberries, basil, snow peas, and mesclun lettuce, though a single vehicle was not always confirmed.

Fresh basil and cilantro. Imported fresh herbs have been recurring vehicles. A review of outbreak data noted that the fruits and vegetables most frequently linked to U.S. cyclospora infections were raspberries (34%), basil (31%), cilantro (10%), and salad mixes (10%), with sugar snap peas also implicated. In the decade preceding that analysis, five U.S. outbreaks were caused by fresh produce imported from Mexico, including three tied to contaminated cilantro.

Raspberries. Imported raspberries were among the earliest recognized vehicles in U.S. cyclosporiasis outbreaks, and the 1997 season included a raspberry-associated event that sickened approximately 762 people. The recurring appearance of the parasite across berries, herbs, and leafy greens reflects the difficulty of eliminating a pathogen that is environmentally resilient and not reliably removed by washing or routine sanitizing.

Industry and Regulatory Response

The 2026 outbreak prompted action on multiple fronts.

In his October letter, Bruce Taylor outlined a four-part response: an indefinite seasonal suspension of central Mexico iceberg lettuce for the U.S. and Canadian markets; expanded year-round health monitoring and increased irrigation-water and crop testing in Mexico; investment in new research and technology for cyclospora detection and prevention; and participation in a public-private task force with the FDA, scientists, industry leaders, and public health officials to identify lasting prevention measures for all fresh produce growers.

The FDA, which closed its outbreak investigation on October 2, 2026, transitioned to post-response, prevention-oriented activities. The agency released a ten-point plan to reduce the risk of cyclospora contamination in fresh produce before the 2027 growing season, covering increased surveillance of commodities historically associated with the parasite, updates to its Cyclospora Prevention, Response and Research Action Plan, and engagement with Mexican public health and agricultural officials under the U.S.–Mexico Food Safety Partnership. The agency also sent a letter to industry calling for collaboration to address contamination throughout the supply chain.

The CDC declared the lettuce-linked outbreak over on September 11, 2026. The FDA’s final sample results, released October 2, confirmed the presence of Cyclospora in the growing and processing environment but did not establish a single point of contamination.

Prevention and the Limits of Consumer Action

The CDC advises that the best way for people to prevent cyclospora infection is to avoid consuming food or water that may be contaminated with stool, and to be aware that the parasite is unlikely to be killed by routine chemical disinfection or sanitizing. Cooking produce to an internal temperature of 158°F (70°C) is effective, but it is not a practical option for the raw leafy greens and herbs most often implicated in U.S. outbreaks. Thorough washing of fruits and vegetables can reduce risk but does not reliably eliminate the parasite.

Because the oocysts require time outside the host to become infectious, direct person-to-person spread is unlikely, and standard hygiene measures in food service and agriculture, particularly preventing fecal contamination of water and produce, remain the primary control points.

The 2026 outbreak illustrates the scale that a single contaminated produce item can reach in a consolidated supply chain. More than 19,000 confirmed U.S. cyclospora cases were reported in a single season, with the lettuce-linked event alone accounting for more than 12,000 illnesses, 570 hospitalizations, and two deaths. For public health officials, the event has reinforced the need for environmental surveillance at the growing and processing level, improved diagnostic capacity in clinical laboratories, and continued attention to the seasonal produce imports that have repeatedly introduced Cyclospora into the U.S. food supply.