The FDA has identified one farm as the source of the whole-head romaine lettuce that sickened several people at a correctional facility in Alaska. However, the agency has not determined where in the supply chain the contamination occurred, and it is not the cause of the whole E.coli outbreak.

It’s the latest news in the FDA’s continuing investigation into illnesses related to chopped romaine lettuce from the Yuma growing region. The lettuce has caused a multistate outbreak of Shiga toxin-producing Escherichia coli O157:H7 (E. coli O157:H7) infections.