An outbreak of a nasty strain of E. coli in Germany has killed more than two dozen people and sickened more than 2,700 others. German authorities are still struggling to determine the source of the virus. Melissa Block talks to food safety expert Dr. David Acheson, formerly of the Food and Drug Administration, about the forensics of tracking down food contamination.
How Do Officials Find An E. Coli Oubreak's Source?
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