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  • 12-12-2018
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When, where, and by whom were vaccines for polio developed? Which vaccine is most effective, and why?

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5922003270 5922003270
  • 12-12-2018

Jonas Salk. Jonas Edward Salk October 28, 1914 – June 23, 1995 was an American medical researcher and virologist. He discovered and developed one of the first successful polio vaccines. He discovered it in  Pittsburgh


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