Chipotle Mexican Grill on Wednesday morning said it has been served with a grand jury subpoena from a federal court in California as part of a criminal investigation related to a norovirus outbreak at a restaurant in Simi Valley, Calif.   Meanwhile, the beleaguered burrito chain said that its same-store sales plunged 30 percent in December amid continuing news of an E. coli outbreak in several states as well as a norovirus outbreak at a restaurant in Brighton, Mass., in early ...

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