date:Nov 05, 2018
n order to help gather evidence needed to identify the source of the outbreak.
The environmental assessment issued today confirms the presence of E. coli O157:H7 in three samples of irrigation canal water collected as part of this investigation in the Yuma region. It considers that the most likely way the romaine lettuce became contaminated was from the use of water from the irrigation canal, since the outbreak strain was not found in any of the other samples collected in the region. How the wa