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An American physician and medical researcher who developed the first safe and effective vaccine. which is?

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polio vaccine, preparation of poliovirus given to prevent polio, an infectious disease of the nervous system. The first polio vaccine, known as inactivated poliovirus vaccine (IPV) or Salk vaccine, was developed in the early 1950s by American physician Jonas Salk. This vaccine contains the killed virus and is given by injection.

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