TED Ed: How Do Vaccines Work? by john cheng

There is quite a bit of talk now about vaccines due to the number of rising cases of measles, but rather than talk about whether or not you should vaccinate, here is a great video by TED Ed explaining how vaccines work. Check it out!

View full lesson: 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?