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FDA Report Highlights Salmonella Outbreak in Packaged Leafy Greens

The U.S. Food and Drug Administration (FDA) has released a report on its investigation o f the  Salmonella  Typhimurium outbreak that caused 31 reported illnesses and four hospitalizations in the U.S. between June and August 2021.
The FDA worked with the U.S. Centers for Disease Control and Prevention (CDC) and state partners  to investigate the outbreak , which was linked through epidemiology and traceback to packaged salad greens during the summer of 2021.
This outbreak is believed to be the FDA’s first domestic investigation of a foodborne illness outbreak associated with leafy greens grown in a Controlled Environment Agriculture (CEA) operation. The CEA operation produces leafy greens using common commercial high-density hydroponic growing techniques with deep water culture and floating raft production methods. The report released today includes an overview of the traceback investigation, investigation results, and various factors that potentially contributed to the contamination of packaged leafy greens with  Salmonella .
Although a conclusive root cause was not identified, the agency identified certain conditions and practices that could result in contamination, including the presence of a different serotype of  Salmonella  in pond water used to grow the leafy greens, growth media storage practices, water management practices, and general sanitation practices at the CEA that were inadequate to prevent the introduction or spread of microorganisms of public health significance into the leafy greens.
FDA isolated the outbreak strain of  Salmonella  Typhimurium in a stormwater retention basin adjacent to the CEA farm. However, the investigation did not reveal if that stormwater retention basin was the source of the Salmonella that ultimately contaminated the leafy greens. This highlights the importance of assessing all microbial hazards, including those associated with adjacent and nearby land uses.
In light of this report, FDA highlights the following requirements and recommendations applicable to firms, such as the hydroponic operation implicated in this S. Typhimurium outbreak, engaged in CEA. Here are some of the requirements and recommendations:
Develop a keen understanding of potential sources and routes of contamination including the raw materials and inputs used, as well as possible sources of contamination throughout the operation.
Implement effective sanitation procedures and sampling plans while also paying close attention to hygienic operations and equipment design, ensuring cleaning procedures do not contribute to the dispersion of microbial contaminants that may be present.
Assess growing operations to ensure implementation of appropriate science- and risk-based preventive measures, including applicable required provisions of the FDA Food Safety Modernization Act (FSMA) Produce Safety Rule and good agricultural practices (GAPs).
Implement procedures that are effective in rapidly cooling and cold holding harvested leafy greens after harvest and verify the effectiveness of the cooling and cold holding procedures, including the routine monitoring of processing and storage environments and product temperatures to prevent pathogen growth in harvested leafy greens.
If employing tools such as pre-harvest and post-harvest sampling and testing of food, water, and the physical environment, seek to identify and inform sampling plans, limits of detection, and mitigation measures that control potential sources and routes of bacterial contamination in the growing and harvesting environment.
Ensure that all growing pond water is safe and of adequate sanitary quality for its intended use, which includes implementing measures (such as water treatment) necessary to reduce the potential for contamination by known or reasonably foreseeable hazards.
Perform a root cause analysis when a pathogen is identified in the growing environment, in raw agricultural inputs such as water, or in the agricultural commodity to determine how the contamination likely occurred and implement appropriate prevention and verification measures.
Assess and mitigate risks associated with adjacent and nearby land uses that may impact CEA operations, in both rural and more urbanized settings.
These requirements and recommendations are just some examples that serve as a reminder that as the use of CEA is increasing globally, all types of food production must continue to address basic food safety concerns, including potential sources and routes of contamination. Food safety is a shared responsibility that involves food producers, distributors, manufacturers, retailers, and regulators. Recognizing the interconnection between people, animals, plants, and their shared environment when it comes to public health outcomes, we encourage collaboration among various groups in the broader agricultural community (i.e., produce growers, state government and academia) to address this issue. The FDA is committed to working with these stakeholders to advance critical work.
For More Information:
Outbreak Investigation Report: Factors Potentially Contributing to the Contamination of Packaged Leafy Greens Implicated in the Outbreak of  Salmonella  Typhimurium During the Summer of 2021
FDA Outbreak Advisory:  Salmonella  Typhimurium: Packaged Salad Greens (July 2021)
Salmonella  (Salmonellosis)

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