jazminjb6737 jazminjb6737
  • 28-12-2021
  • Health
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how long did it take to develop the smallpox vaccine?

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sugarlipscandycat
sugarlipscandycat sugarlipscandycat
  • 29-12-2021
In 1798 the first smallpox vaccine was developed.Over the 18th and 19th centuries,systematic implementation of mass smallpox immunization culminated in its global eradication in 1979.
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