On March 26, 1953, American medical researcher Dr. Jonas Salk announces on a national radio show that he has successfully
tested a vaccine against poliomyelitis, the virus that causes the
crippling disease of polio.



On March 26, 1953, American medical researcher Dr. Jonas Salk announces on a national radio show that he has successfully
tested a vaccine against poliomyelitis, the virus that causes the
crippling disease of polio.



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