How do vaccines work? 

Animation: Cinematic

Client: TED-ed
Educator: Kelwalin Dhanasarnsombut

Script Editor: Emma Bryce

Narrator: Addison Anderson
 

The first ever vaccine was created when Edward Jenner, an English physician and scientist, successfully injected small amounts of a cowpox virus into a young boy to protect him from the related (and deadly) smallpox virus. But how does this seemingly counterintuitive process work?