It's getting close to that time of the year again, when the flu starts to wreak havoc. And so, with the help of NPR's Robert Krulwich and medical animator David Bolinsky, we're taking an animated look at what actually happens when a virus invades your body and tricks a single cell into making a million more viruses, and how your immune system eventually deals with the whole mess. It's a nice demystification of phenomena that affects our everyday lives. If you feel inclined to get a flu shot after watching this clip, I can't say that I blame you.

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