BOL

When you get the flu, viruses turn your cells into tiny factories that help spread the disease. In this animation, NPR's Robert Krulwich and medical animator David Bolinsky explain how a flu virus can trick a single cell into making a million more viruses.

See and hear the rest of the story on NPR.org: http://www.npr.org/templates/story/story.php?storyId=114075029

Credit: Robert Krulwich, David Bolinsky, Jason Orfanon