Flu Attack! How A Virus Invades Your Body | Krulwich Wonders | NPR

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.

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Credit: Robert Krulwich, David Bolinsky, Jason Orfanon