FDA expands Cyclospora outbreak probe tied to recalled iceberg lettuce to 15 states, first deaths confirmed

The Food and Drug Administration said it expanded its investigation into a Cyclospora outbreak tied to recalled iceberg lettuce, moving the probe to 15 states after the first two deaths associated with the outbreak were confirmed, The Hill reported Wednesday. FDA officials linked the outbreak to shredded iceberg lettuce and emphasized that the agency is continuing to work with public health partners to identify additional cases and determine the source of contamination.

The outbreak was first identified in July among people who ate shredded iceberg lettuce at Taco Bell restaurants, according to the report. Investigators traced illnesses to products that were later recalled, and the agency’s ongoing review has focused on how contaminated lettuce may have been distributed and served.

Cyclospora is a microscopic parasite that can cause prolonged gastrointestinal illness. As the FDA’s investigation has widened, state and local health departments have continued collecting information about reported illnesses, including the timing of symptoms and whether affected people reported eating the lettuce product in question.

The FDA’s latest update reflects a broader geographic footprint than earlier case clusters, the report said. Officials identified the outbreak as no longer limited to the initial states where illnesses were first reported, and the additional case information helped prompt the agency to expand the investigation.

The agency’s work comes as recalled food products remain under scrutiny for potential continued exposure, with FDA coordinating investigative steps intended to identify affected lots and reduce the risk of further infections. The practical effect of the expansion is to broaden the pool of jurisdictions monitoring potential cases and sharing data to support epidemiologic conclusions.

Federal investigators and public health agencies also use outbreak updates to refine public-facing guidance, including recommendations for identifying symptoms and seeking medical evaluation. As additional cases are reported across more states, clinicians and local public health officials generally rely on the evolving case definition tied to the implicated food source.

The FDA said the initial deaths being confirmed underscores the seriousness of the investigation, The Hill reported, while officials continued to assess the scope of illness. The agency’s expanded geographic focus is expected to generate further information on distribution, consumption patterns, and whether additional products beyond the initially identified lettuce supply are implicated.