Federal Health Officials Trace Major Cyclospora Outbreak to Iceberg Lettuce

The United States is experiencing a significant surge in cyclosporiasis cases, with federal health officials reporting thousands of infections linked to contaminated food products. According to the Centers for Disease Control and Prevention (CDC), there have been 4,173 laboratory-confirmed, domestically acquired cases of the parasitic illness since May 1, 2026, with an additional 7,400 cases currently pending confirmation. The surge is concentrated heavily in Michigan and Ohio, representing a stark increase compared to the same period last year, when only 249 cases were reported nationally.

A major portion of the current outbreak has been epidemiologically linked to contaminated iceberg lettuce imported from Taylor Farms de Mexico. The contamination has primarily affected consumers in five states: Indiana, Kentucky, Michigan, Ohio, and West Virginia. In response to the findings, Taylor Farms de Mexico initiated a voluntary recall on July 17, 2026, withdrawing all iceberg lettuce sourced from central Mexico from commercial distribution.

The recalled lettuce was distributed to multiple commercial and retail outlets in the affected states. This includes Marketside-brand products sold at Walmart retail locations and iceberg lettuce served at Taco Bell restaurants. Health departments in the impacted states are urging consumers and food service operators to ensure they are not consuming or serving products covered by the voluntary recall.

In addition to the lettuce-related outbreak, the Food and Drug Administration (FDA) announced on July 22, 2026, that it has identified a separate Cyclospora outbreak. This new outbreak has sickened 72 people, though its specific source remains unknown. The FDA and state partners are currently conducting a traceback investigation to isolate the source of this second, unrelated cluster of infections.

The concurrent outbreaks highlight a persistent public health challenge in tracing foodborne pathogens through complex, international agricultural supply chains. Because Cyclospora is a microscopic parasite that causes prolonged gastrointestinal illness, identifying the exact point of contamination requires extensive coordination between local healthcare providers, state laboratories, and federal investigators. Officials indicate that investigations into both the recalled shipments and the newly identified cases remain active.