Tracking Listeria-Q&A

A Blue Bell Ice Cream truck stops at Walgreens in Dallas on Thursday morning, April 23, 2015. Texas-based Blue Bell Creameries recalled all its products this week after listeria was found in a variety of the company’s frozen treats. New technologies account for one way that the government is tracking a life-threatening outbreak of listeria linked to Blue Bell ice cream products. Listeria is a heartyy bacteria found in soil and water that can be tracked into a plant or carried by animals. (David Woo/The Dallas Morning News via AP)

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