Chipotle Mexican Grill, Inc. said it has hired two food safety consulting firms, including IEH Laboratories and Consulting Group, to help assess and improve its food safety standards. On Nov. 1, it was reported that Chipotle closed 43 locations in Washington state and Oregon following links between an E. coli outbreak and the chain. The investigation into the outbreak continues, and Chipotle said in a statement that it's cooperating with investigators. Chipotle shares are down 2.7% this week. The S&P is up 1.5% for the same period.
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