Cyclosporiasis, an intestinal infection caused by the microscopic parasite Cyclospora cayetanensis, has triggered a significant multi-state outbreak in the United States, resulting in over 1,600 laboratory-confirmed cases and more than 100 hospitalizations as of late July 2026. According to the U.S. Centers for Disease Control and Prevention (CDC) and the Food and Drug Administration (FDA), the outbreak has been linked to contaminated shredded iceberg lettuce supplied to Taco Bell restaurants across several states, including Michigan, Ohio, and Kentucky.
Tracking the Source of the Cyclospora Outbreak
The FDA’s traceback investigation identified a single supplier, Taylor Farms de Mexico, as the source of the contaminated iceberg lettuce. In response to the investigation, the company initiated a voluntary recall of all iceberg lettuce sourced from central Mexico. According to an FDA notice, the recall included products distributed to various retail outlets, such as Marketside-brand lettuce sold at Walmart locations in the U.S.
The complexity of detecting the parasite was highlighted on July 19, when the FDA reported that a sample of shredded lettuce initially tested positive for Cyclospora at the U.S.-Mexico border, only for that result to later be classified as a false positive. Despite this, federal officials maintained that “overwhelming epidemiological data” supported the necessity of the voluntary recall to protect public health.
Clinical Symptoms and Transmission Risks
Cyclospora is typically transmitted through the consumption of food or water contaminated with human feces. According to public health data, the parasite is difficult to remove from produce because it lodges in the nooks and crannies of items like berries, cilantro, and leafy greens. Symptoms of cyclosporiasis, which generally appear within a week of ingestion, include watery diarrhea, bloating, fever, and nausea. While the infection is rarely fatal, it can lead to severe dehydration.
Pro Tip: While washing fruits and vegetables is a standard safety practice, the British Columbia Centre for Disease Control notes that it will not completely eliminate the risk of Cyclospora infection. Cooking the produce remains the most effective method for killing the parasite.
Cross-Border Health Surveillance
While the U.S. has experienced a sharp increase in cases, Canadian health officials report a different landscape. The Public Health Agency of Canada (PHAC) stated as of July 20 that it is not investigating any Cyclospora outbreaks within its borders. The Canadian Food Inspection Agency (CFIA) confirmed it is in contact with the FDA and monitoring the situation, noting that there is currently no evidence that the products implicated in the U.S. outbreak were distributed in Canada.
In Quebec, health authorities reported 85 cases of cyclosporiasis since the beginning of 2026, a figure higher than the annual average of 32 cases recorded between 2022 and 2025. However, the province’s Ministry of Health and Social Services clarified that these cases are largely linked to travel, primarily to Mexico, rather than the U.S. outbreak.
Frequently Asked Questions
Is Cyclospora contagious from person to person?
No. According to public health guidelines, the illness does not spread directly from person to person. It is contracted by ingesting food or water contaminated with the parasite.
What foods are most commonly associated with Cyclospora?
Historically, the parasite has been linked to imported fresh produce, including basil, cilantro, raspberries, blackberries, mesclun lettuce, snow peas, and pre-packaged salad mixes.
Why are case numbers sometimes higher than reported?
The true number of infections is likely higher than official counts because many individuals recover without seeking medical treatment, and there is a documented time lag between symptom onset and official reporting.
Have you been affected by recent food safety recalls? Stay informed by checking the latest updates from the FDA and the CDC. Subscribe to our health newsletter for ongoing coverage of food safety trends and public health alerts.
Keep reading