Skip to main content
          Skip to FDA Search
          Skip to in this section menu
          Skip to footer links


U.S. flagAn official website of the United States government

					Here’s how you know
          			Dot gov**The .gov means it’s official.**Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you're on a federal government site.
							      SSL**The site is secure.** The **https://** ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely. 
			U.S. Food and Drug Administration
				
        Search
            Menu
							
						Search FDA
									
									Submit search 
		Featured
							Contact FDA
	                FDA Guidance Documents
	                Recalls, Market Withdrawals and Safety Alerts
	                Press Announcements
	                Warning Letters
	                Advisory Committees
	                En Español

					Products
            Food
							Drugs
							Medical Devices
							Radiation-Emitting Products
							Vaccines, Blood, and Biologics
							Animal and Veterinary
							Cosmetics
							Tobacco ProductsTopics
            About FDA
							Combination Products
							Regulatory Information
							Safety
							Emergency Preparedness
							International Programs
							News and Events
							Training and Continuing Education
							Inspections and Compliance
							Science and ResearchInformation For
            Consumers
	            Patients
	            Industry
	            Health Professionals
	            Federal, State and Local Officials 
 In this section:

                CFSAN Constituent Updates

CFSAN Constituent Updates Home
          Food
          News & Events from CFSAN
          CFSAN Constituent Updates
          FDA Releases Report on Findings from Sampling of Romaine Lettuce in Yuma, AZCFSAN Constituent Updates FDA Releases Report on Findings from Sampling of Romaine Lettuce in Yuma, AZ
  
  	
    Subscribe to Email Updates
    Share
    Post
    Linkedin

    Email
    PrintConstituent Update

October 7, 2021

The FDA is releasing the findings of a **sampling assignment** for which FDA collected and tested romaine lettuce from commercial coolers in Yuma County, Arizona during February and March 2021. The agency tested the lettuce for Shiga toxin-producing *Escherichia coli* (STEC), specifically enterohemorrhagic *Escherichia coli* (EHEC), and *Salmonella* spp. This assignment was part of the FDA’s ongoing surveillance following multistate *E. coli* O157:H7 outbreaks of foodborne illness in recent years linked to or potentially linked to romaine lettuce.

The agency’s goal in conducting this assignment was to determine whether the target pathogens and specific strains may be present in romaine lettuce from the Yuma agricultural region, to help prevent foodborne illness when possible. If product that tested positive for EHEC or *Salmonella* was found, the Agency planned to work with industry and state regulatory partners to identify the cause (e.g., farm follow-up investigation) to inform future regulatory and/or research efforts and to develop strategies that could help preventive additional outbreaks.

The FDA collected 504 romaine samples for EHECs and*Salmonella* spp., with the testing performed by an independent laboratory on contract, as part of a pilot project. Each sample consisted of 10 subsamples, and each subsample was made up of at least 300 grams of romaine lettuce (whole heads, hearts or individual leaves).  Collecting and testing samples composed of multiple subsamples increases the probability of detecting pathogens if present, since microbial hazards may not be uniformly present.

During the assignment the FDA detected *E. coli* O130:H11 in one sample.  The isolate was found to be moderate to high risk and could be capable of causing severe illness in humans, though it was not linked to any known human illnesses, and no product ever reached consumers. The owner of the product did not harvest the remaining crop from the field where it was grown.

In response to the finding, FDA conducted an investigation at the farm to identify possible sources and routes of contamination. The FDA was able to collect romaine lettuce from the field, multiple samples of soil, water, sediment, and animal fecal material. FDA also assessed farm equipment and other surfaces. Only one of the total 24 samples yielded STEC (specifically, *E. coli*O116:H-). This sample came from the outer leaves of romaine lettuce. The strain was further characterized as low risk to human health, and FDA’s analysis indicated the strain was not linked with any past known foodborne illness outbreaks.

Helping to ensure the microbiological safety of leafy greens continues to be a priority of the FDA. Romaine lettuce and other leafy greens are among the most widely consumed vegetables in the United States and are an important part of a healthy diet. The agency is working on several fronts to help prevent microbial contamination of leafy greens and to prevent outbreaks of foodborne illness. Chief among these efforts is the FDA’s Leafy Greens STEC Action Plan (LGAP), which features public health approaches related to response, prevention and addressing knowledge gaps. The FDA continues to collaborate with industry, states, academia and other stakeholders through activities outlined in the LGAP to address this important public health issue.

                                                                                  Content current as of:
      10/07/2021
              
              
Regulated Product(s)
		 Food & BeveragesCFSAN Constituent Updates
 Subscribe to CFSAN Constituent Updates
                        Get email updates delivered to your inbox.
    Enter your email address to subscribe:
 Footer Links
    FDA Archive
          About FDA
          Accessibility
      Visitor Information
          Website Policies / Privacy
          No FEAR Act
          Vulnerability Disclosure Policy
      FOIA
          HHS.gov
          USA.gov
    Contact FDA
      Follow FDA on Facebook
      Follow FDA on X
      Follow FDA on Instagram
      Follow FDA on LinkedIn
      View FDA videos on YouTube
      Subscribe to FDA RSS feeds
    FDA Homepage
    Contact Number
      1-888-INFO-FDA (1-888-463-6332) Back toTop