If you’ve never heard the story of the first vaccine, you're in for a treat (or a grimace). Edward Jenner, a British physician, scraped fluid from a cowpox sore on a milkmaid’s arm and promptly jabbed it into eight-year-old James Phipps. Later, Jenner exposed James to smallpox, and—voilà—James didn’t get sick. Neither did anyone in his household.
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