A Chipotle Mexican Grill in Robinson Township, Pa., on Jan. 28, 2014. Chipotle says it is tightening its food safety standards after its restaurants were linked to dozens of cases of E. coli. The Mexican food chain says it hired IEH Laboratories in Seattle to help improve its system after reports in late October 2015 that linked E. coli cases to its restaurants in Oregon and Washington. Since then, additional cases have been reported in California, Minnesota New York, and Ohio. (AP Photo/Gene J. Puskar)
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