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  1. CFSAN Constituent Updates

FDA to Implement Sampling Effort for Lettuce Grown in Salinas Valley, California

Constituent Update

May 11, 2021

The U.S. Food and Drug Administration will be collecting and testing samples of lettuce grown in California’s Salinas Valley from local commercial coolers from May through November 2021. The agency will test the samples for Shiga toxin-producing Escherichia coli (STEC), including E. coli O157:H7, and Salmonella spp. as part of ongoing surveillance efforts following reoccurring outbreaks linked to this region, including most recently in the fall of 2020.

The FDA assignment will direct sampling to be conducted at commercial cooling and cold storage facilities where field heat is removed from harvested lettuce and where product is cold-stored before processing. Sampling may include pre-cooled product (preferred) or post-cooled product. Sample collection at commercial coolers helps the FDA efficiently obtain samples from multiple farms at centralized locations and facilitates prompt traceback and follow-up if contamination is detected.

The agency plans to collect and test a total of approximately 500 post-harvest samples of iceberg, leaf and romaine lettuce. Each sample will consist of 10 subsamples, each made up of one head of lettuce (trimmed, cored and possibly wrapped), or in the case of romaine lettuce, loose leaves or one package of hearts.  FDA laboratories will conduct all testing.

During this sampling assignment, the FDA will take extra precautions to help ensure the safety of agency investigators and firm employees during the COVID-19 pandemic. FDA investigators will preannounce their visits to firms per the Agency’s COVID-19 safety practices. They will be outfitted with personal protective equipment (PPE) and will carry out their work while adhering to local, state and applicable CDC guidance.

Helping to ensure the safety of leafy greens remains a high priority of the FDA. This assignment adds to other work underway in collaboration with stakeholders in the California Central Coast growing region to identify where the recurring strain of pathogenic E. coli is persisting and the likely routes of leafy green contamination with STECs.  This includes continued implementation of actions identified in the recently updated Leafy Greens Action Plan, including a multi-year longitudinal  study to assess the environmental factors impacting the presence of foodborne pathogens in this region. Consistent with the action plan, if the FDA detects a pathogen such as E. coli O157:H7, the agency will conduct a follow-up investigation to identify potential sources and routes of contamination. Such investigations are designed to inform what additional preventive measures may be needed to help prevent outbreaks of foodborne illness.


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