IRVINE Calif. Taco Bell Corp. has directed the chain’s 5,800 domestic units to discard green onions from their kitchens after tests suggested the ingredient could be the source of an E.coli outbreak in Pennsylvania, New York and New Jersey. The company, based here, described the tests as “preliminary and not yet conclusive,” but said it was ridding its operations of green onions, or scallions, as a precaution. Three samples had returned “presumptive positive” results in ...

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