Federal health officials said that shredded iceberg lettuce served at Taco Bell caused a multistate outbreak of the parasite Cyclospora.

The confirmation marks a critical step in identifying the source of a widespread diarrheal illness that has affected thousands of consumers across the Midwest. Because the parasite can persist in the environment, identifying the specific contaminated product is essential for preventing further infections.

The U.S. Centers for Disease Control and Prevention (CDC) and the Food and Drug Administration (FDA) said the source was shredded iceberg lettuce [1, 2]. This specific produce originated from Mexico [2, 5]. The outbreak primarily impacted Taco Bell locations in five states: Indiana, Kentucky, Michigan, Ohio, and West Virginia [2, 5].

Health officials said that 1,644 people became sick with cyclosporiasis linked to the lettuce [3]. The parasite causes an illness characterized by watery diarrhea, abdominal cramps, and nausea.

While federal officials focused on the origin of the lettuce in Mexico, some reports linked the outbreak specifically to iceberg lettuce supplied by Taylor Farms [6]. Other reports did not name a specific supplier, citing only the country of origin [2, 5].

Cyclospora is a microscopic parasite that often contaminates fresh produce during the growing or packing process. Because the parasite is hardy, it can survive various cleaning methods, making the identification of the source critical for supply chain safety. The CDC continues to monitor the situation to ensure all contaminated products are removed from the food supply.

“Shredded iceberg lettuce served at Taco Bell was confirmed as the source of a multistate outbreak.”

This outbreak highlights the persistent vulnerability of the fresh produce supply chain to parasitic contamination. Because Cyclospora is difficult to detect and eliminate through standard washing, the scale of this infection—affecting over 1,600 people—underscores the risk associated with importing high-volume produce from regions where agricultural oversight may vary.