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 ...See moreThe 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?
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