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How do vaccines work? – TED-Ed

How do vaccines work? – TED-Ed

by | Jul 23, 2018 | Gr. 11-12 Biology

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...
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