Factors Potentially Contributing to the Contamination of Romaine Lettuce Implicated in the Three Outbreaks of E. coli O157:H7 During the Fall of 2019

This document provides an overview of the investigation approach and factors that potentially contributed to the contamination of romaine lettuce with E. coli O157:H7 in two multistate and one single-state foodborne illness outbreaks in the fall of 2019.

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