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Traceback diagram for multi-state foodborne illness outbreak of STEC infections linked to the consumption of romaine lettuce from the Yuma growing region in spring, 2018. Purchases of romaine lettuce products are traced from the point of service, through the distribution chain, to processors, distributors, and farms. Product originates from individual ranches, a subdivision of farms, denoted on the right side of the diagram*. *Updated as of October 22, 2020
