Tips on keeping safe amid listeria outbreak

As of Friday evening, three people have died in the U.S. due to the listeria outbreak linked to Boar's Head deli meats. In July, Boar's Head recalled seven million pounds of deli meats after a liverwurst sample collected in Maryland tested positive for listeria. CBS News chief medical correspondent Dr. Jon LaPook joins to discuss the risks, diagnosis and how to stay safe.

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